Comparison
Auto vs manual campaigns: the role each plays in a clean account
Auto campaigns find keywords. Manual campaigns own keywords. Run both, in a specific relationship: auto for discovery, manual for control. Pretending you can skip auto is one of the biggest unforced errors.
| Auto | Manual Campaigns | |
|---|---|---|
| Targeting | Amazon picks keywords + products for you | You explicitly set keywords |
| Primary job | Discover new high-converting search terms | Bid precisely on known converters |
| Typical ACoS | Higher (15-40%) | Lower (8-25%) |
| Spend share | 10-25% of total ad spend | 60-80% of total ad spend |
| Negation discipline | Critical - auto pulls junk too | Important but lighter |
| Reporting cadence | Weekly harvest of new terms | Daily/weekly for bid tuning |
Use Auto when
Always run at least one auto campaign per SKU bucket. Even mature accounts benefit from auto discovery against new shopping behaviour.
Use Manual Campaigns when
Always. Manual is where 70%+ of spend lives in a mature account.
Operator's verdict
Run both. Auto's job is to find what works; manual's job is to scale what auto found. The harvest cadence (auto search terms -> negate junk -> graduate winners to manual) is the discipline that separates accounts that compound from accounts that plateau.