The Secrets of Low ACoS: Auto vs. Manual Targeting on Amazon

Amazon PPC campaigns typically start with a choice:

🤖 Automatic targeting
🧠 Manual targeting

Some sellers swear by one, others avoid one entirely.

But if you really want to lower your ACoS, scale your ads, and dominate your niche — you need to understand the strengths and weaknesses of both.

Let’s dive in.

🎯 Auto Campaigns: Pros & Cons

✅ Pros:

  • Easy to set up — no keywords needed
  • Great for keyword discovery
  • Catch all variations, misspellings, synonyms
  • Great for product targeting you didn’t know existed

❌ Cons:

  • Lack of control over bidding
  • Can trigger for irrelevant terms
  • Easily overspend without tight budgets
  • Not suitable for aggressive scaling

🧠 Manual Campaigns: Pros & Cons

✅ Pros:

  • Total control over which keywords trigger ads
  • Adjustable bids at the keyword level
  • Supports refined targeting (match types, ASINs)
  • Ideal for scaling known winners

❌ Cons:

  • Slower to set up
  • Requires strong keyword research or auto data
  • May miss long-tail discovery if done in isolation

🔁 The Real Power: Combine Auto + Manual

The best strategy isn’t choosing one — it’s using Auto to feed Manual.

Here’s how it works:

1. Start Auto Campaign:

  • Set low daily budget ($10–$30)
  • Broad net to catch keyword and ASIN data

2. Monitor Search Term Report Weekly:

  • Look for terms with:
    • High CTR
    • Conversions
    • Low ACoS

3. Transfer Winners to Manual Campaign:

  • Add converting keywords to manual exact or phrase
  • Set specific bids
  • Add that keyword as a negative exact in Auto to avoid overlap

This creates a feedback loop that fuels efficient growth.

📊 Real Example

Brand: Kitchen Accessories

  • Auto ACoS: 52%
  • Manual ACoS: 28%
  • Combined strategy: Used Auto to find 12 new high-performing keywords

Result after 45 days:
✅ Manual campaign drove 75% of sales
✅ ACoS dropped below 25%
✅ Auto budget reallocated to new ASIN targeting

🧱 Best Practices for Auto Campaigns

  1. Run one ASIN per campaign
  2. Use tightly controlled budgets
  3. Adjust targeting settings:
    • Close match
    • Loose match
    • Substitutes
    • Complements
  4. Add negatives weekly to block wasted spend

📐 Best Practices for Manual Campaigns

  1. Create 3 ad groups per campaign:
    • Exact
    • Phrase
    • Broad (optional for continued discovery)
  2. Use different bids per match type
  3. Add high-performing terms from Auto
  4. Monitor keyword-level ACoS weekly

🧠 When to Use Auto

ScenarioAuto Recommended?
New product with no PPC history✅ Yes
Exploring new ASIN/product targeting✅ Yes
Scaling with known keyword winners❌ No
Product with clear niche keywords❌ Prefer Manual

🔧 Tools to Help

  • Helium 10 Adtomic
  • Pacvue
  • Amazon Bulk Files
  • Data Dive (for keyword expansion)

These tools can help you automate keyword transfers, ACoS alerts, and campaign structure.

🛡 Bonus Tip: Campaign Harvesting SOP

  1. Run Auto for 2 weeks
  2. Pull Search Term Report
  3. Filter for:
    • Sales > 1
    • ACoS < 40%
  4. Add to Manual campaign
  5. Add same term as negative exact to Auto
  6. Repeat weekly

This keeps your Manual campaigns lean and powerful, and your Auto campaigns constantly feeding new traffic.

🚀 Final Thoughts

The myth that Auto campaigns are bad needs to die.

They’re a data engine — not a growth engine.

Manual campaigns are your scaling engine — but they need data to run on.

Together, they form a flywheel of:

  • Discovery
  • Optimization
  • Scale

And THAT’S the real secret to lower ACoS on Amazon.

💬 Want Us to Do It for You?

At Marketplace Valet, we run full-funnel Amazon ad systems using this exact approach.

✅ Campaign buildout
✅ Weekly harvesting + negatives
✅ ACoS control + scaling strategies
✅ Full transparency in performance

📩 Let’s talk → justin@marketplacevalet.com