Are You Overspending on Meta? Here's How to Know.
The CPA variance check to run today.
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If you're spending $50K+/month on Meta, there's a good chance you're paying more per conversion than you need to - and the problem scales with spend. At $500K/month, it's a real budget issue.
Highest Volume is the default campaign setting. Meta's objective is to spend the full budget and maximize conversion volume - even when CPA climbs above your target or pushes into unprofitable territory.
Cost per result goal (CPRG - what many still call "cost caps") sets a ceiling on what Meta can pay per conversion. But it's widely misunderstood. Here's when to use it and how to set it without breaking delivery.
Everyone's obsessed with growing their SMS list.
But nobody's really looking at what happens after the text goes out.
> A subscriber replies asking if the hoodie runs big> Another one asks if it'll ship before her mom's birthday> Another wants to know the difference between two flavors
And those messages just... sit there. Or get a canned response 4 hours later when the intent is already dead.
That's a conversion problem hiding as a staffing problem.
I’ve seen Postscript's Shopper and it's the first thing I've seen that actually handles this at the scale it needs to be handled at.
It's an AI shopping assistant that replies to every inbound text instantly, in the brand's voice, and it can do the stuff a good sales associate does:
> Answer product questions > Recommend gifts based on who they're shopping for > Help with order status and issues > Actually close the sale instead of deflecting to support
Without needing to hire people, hope they respond in time, and are in a good mood for conversations with your customers.
Postscript also has a live version running with Original Grain that you can text yourself from inside the email to see exactly what your subscribers would experience.
You send a real message, you get a real reply. Took me about 90 seconds.
If you're already sitting on a subscriber list and you've been feeling like the replies are piling up faster than anyone on your team can get to, this is worth 10 minutes.
What Highest Volume Is Doing
Highest Volume spends your budget without accounting for strategic purchasing over time to capture CPA variance advantages.
Low auction competition, efficient creative, and favorable CPMs might get you conversions at $28. The next day auction competition spikes, and the same budget spends at $74.
The CPA variance is the cost of giving Meta no ceiling.
CPRG - The Feedback You're Misreading
Cost per result goal (CPRG) tells Meta to only enter auctions where it predicts it can acquire a conversion at or below your target cost.
If it can't find enough qualifying auctions, it spends less than the full budget.
This can lead to a common misread:
You see CPRG underspend and interpret it as the strategy not working, so you switch back to Highest Volume within 48-72 hours.
This is the wrong call - underspend means CPRG is working exactly as designed. It refused to pay above the threshold
CPRG doesn't reduce delivery quality to underspend - it specifically refuses unprofitable auctions. Every dollar CPRG spends is within your defined efficiency ceiling.
Kynship's philosophy: no delivery is better than bad delivery. The campaign would rather spend nothing than spend at an unprofitable CPA.
Where CPRG Outperforms Highest Volume
High-CPM windows and auction volatility
When auction competition spikes - Black Friday, Q4, peak seasonal periods - Highest Volume keeps spending at any cost. CPRG only enters auctions where it can hit your target CPA.
When CPMs are high, it pulls back. When inventory is cheap, it spends more.
For a brand at $200K/month, this means CPRG automatically allocates budget toward lower-cost periods instead of burning money during expensive windows.
Kynship scaled a client from $24,997 to $203,622 at 1X ROAS during BFCM using CPRG, then to a $500K month at 1.1X ROAS the following month. CPRG aggressively captured cheap inventory during off-peak auction windows while Highest Volume was spending at peak-price rates.
Mature campaigns with established conversion baselines
CPRG performs best when Meta has enough conversion data to predict CPA accurately.
A campaign that has been running for several weeks with consistent purchase events gives Meta a reliable model for when it can and can't hit the target cost.
On a new campaign with no conversion history, CPRG will underspend significantly because the model lacks confidence.
On a campaign with a stable CPA baseline, CPRG locks in that efficiency ceiling and prevents the algorithm from drifting upward during volatility or creative refreshes.
If you switch a brand-new campaign to CPRG and see it flatline, you haven't given the campaign enough time to build the conversion data CPRG needs to work with.
The Account-Level Diagnostic
Pull your active campaigns, and for each campaign, look at CPA for the last 30 days - specifically, the highest CPA day vs. the lowest CPA day.
If the variance between the best and worst day is more than 2x, that's a signal to institute CPRG. The auction is extracting your budget at peak-price periods because the campaign has no ceiling.
If CPA is stable day-to-day with minimal variance, the highest volume is working efficiently. The auction dynamics happen to be consistent enough that a ceiling wouldn't add meaningful value.
How to Set and Adjust the Cap
Two common mistakes operators make when switching to CPRG are setting the cap too low at launch and making large downward adjustments too fast.
Start below your target CPA, not at it.
If the target CPA is $50, start the cap at $30-35. This forces Meta to find only the highest-efficiency auctions in the early days. If the campaign underspends significantly - below 30% of the budget after 72 hours - raise the cap incrementally. Add $5-10 at a time until spend normalizes.
Daily adjustment rules:
Spend coming in above cap: lower it
No spend: raise it
Adjust incrementally.
Keep all adjustments below 15% of the current cap at a time, and limit changes to once or twice a week maximum. Large downward adjustments force the algorithm to reset and lose accumulated conversion data.
CPRG is a deliberate tradeoff - you give up some volume in exchange for a cost ceiling. Get the cap right, and the system delivers both.
Final Thoughts
You might not need CPRG on every campaign. But if you're spending $50K+/month and haven't run the CPA variance check, you don't know whether Highest Volume is costing you or working fine.
Pull the diagnostic today.
High variance means the default strategy is burning budget on expensive auction days. Low variance means leave it alone.
Highest Volume is the default. CPRG is the ceiling. The audit tells you which campaigns need one.
If you want a growth partner who is invested in helping you build a profitable business, someone who is going to push you to make changes that focus on profitable growth. Book a call - let’s chat.
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Disclaimer: Thank you to Postscript for sponsoring today's newsletter.
