The Bid Strategy That Is Winning Auctions It Should Lose
A sporting-goods seller uses Sponsored Products with a dynamic bidding strategy (down only) and a target ROAS portfolio. Recent changes: they moved 15 campaigns into a portfolio with a 4.0 target ROAS, but several campaigns have historical ROAS of 2.5-3.0. Since the change, impressions are down 22%, sales are down 15%, and ACoS improved slightly. The team is split: one side wants to revert to manual bids, the other wants to lower the target ROAS to 3.0. Budget is $25,000/month; current spend is $19,000 (underspending). The category is competitive and CPCs have risen 12% quarter over quarter.
1. What is happening after moving campaigns into a 4.0 target ROAS portfolio, and why are impressions and sales falling?
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The portfolio target of 4.0 is stricter than what those campaigns historically achieve (2.5-3.0). Under a target-ROAS strategy, the system bids to hit the target, so campaigns that cannot reach 4.0 get throttled - bids drop, they lose auctions, impressions fall 22%, and sales follow down 15%. The slight ACoS improvement is the flip side: the system is winning fewer, more efficient auctions, but at the cost of volume.
The underspend ($19,000 of $25,000) confirms the system is deliberately not spending because it cannot hit 4.0 efficiently. Rising CPCs (+12% QoQ) make the 4.0 target even harder to reach, so throttling is more aggressive than intended. The campaigns are being asked to hit a number their economics do not support.
2. Compare 'revert to manual bids' vs. 'lower the target ROAS to 3.0.' Which do you recommend and why?
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Lower the target ROAS to ~3.0 first - it is the lower-risk, data-supported move. The historical ROAS of 2.5-3.0 tells you 4.0 was mis-set; 3.0 aligns the target with demonstrated performance and should restore auction participation and volume while keeping the system's efficiency automation.
Why not revert to manual immediately:
- Manual bidding discards the portfolio's automated efficiency and adds management overhead across 15 campaigns.
- The problem is a mis-set target, not necessarily a failure of the strategy; fix the input before abandoning the tool.
Why not keep 4.0: it is provably throttling volume and causing underspend.
Plan: set the portfolio target to 3.0, monitor impressions, sales, and ACoS for 2-3 weeks, and only revert the worst-performing campaigns to manual if 3.0 still underdelivers. Keep the 4.0 target only for genuinely high-margin campaigns where the economics support it.
3. Spend is $19,000 against a $25,000 budget while CPCs are rising 12% QoQ. How should bidding and budget be managed to recover volume without wrecking efficiency?
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Treat budget and bid as separate levers:
- Budget: the $6,000 underspend is a symptom of bid throttling, not a budget cap. Fixing the target ROAS should let spend rise toward $25,000 naturally; do not simply raise budgets, which won't help if bids are throttled.
- Bidding: with CPCs up 12%, a 3.0 target is more realistic than 4.0. Consider a mixed strategy - target ROAS for mature campaigns with stable history, and dynamic down-only or manual for campaigns where you want more control over volume.
- Segment: protect high-margin SKUs with tighter targets; allow lower-margin or discovery campaigns more room to spend.
- Monitor weekly: impressions, sales, ACoS, and spend pacing. If 3.0 restores volume, hold; if CPC inflation continues to squeeze, revisit targets campaign by campaign rather than portfolio-wide.