How CasterHQ Recovered $9,400 a Month in Margin by Tripling Their Amazon Ad Efficiency

CasterHQ · Feb 2025 to Mar 2026 · Self Service · Amazon US · 13 Months

CasterHQ was a $100K per month Amazon seller spending $14,760 on ads for a 1.9x return. The business was healthy. The ad budget was bleeding margin. Astra tripled ROAS to 5.9x, cut spend 64%, and put $9,400 back into the business every month.

The margin recovered$9,400/moMonthly margin recovered from reduced wasted ad spend

1.9x to 5.9xROAS before and after Astra

75%Lower cost per click, $1.74 down to $0.44

62%TACOS reduction, 12.9% down to 4.9%

IndustryIndustrial Casters

PlanSelf Service

MarketplaceAmazon US

Active SinceFebruary 2025

Story TypeMargin Recovery

The Challenge

CasterHQ is a $100K per month Amazon seller in industrial casters and hardware. The business was healthy and revenue was stable. The problem was structural and invisible in the day-to-day: their ad budget was inefficient in a way that compounded quietly every month.

They were spending $14,760 per month on Amazon ads and generating $28,023 in ad sales. A 1.9x ROAS. Nearly 13 cents of every revenue dollar consumed by advertising. Not a crisis, not an emergency. Just a slow, consistent margin bleed with no clear path to fixing it manually.

Running ads manually at $100K scale produces a predictable pattern. Targeting casts too wide a net. Budget distributes across keywords where shoppers are not buying. CPCs climb because broad targeting competes in expensive auctions. The fix is not spending less. It is spending smarter, which requires optimization at a speed and granularity no human process can sustain.

Before vs After

Before Astra (DIY Baseline)

• —Ad ROAS: 1.9x
• —TACOS: 12.9%
• —Monthly ad spend: $14,760
• —Monthly ad sales: $28,023
• —Monthly total sales: $114,356

With Astra (13 Months)

• Ad ROAS: 5.9x
• TACOS: 4.9%
• Monthly ad spend: $5,368
• Monthly ad sales: $31,726
• Monthly total sales: $108,570 (revenue held steady)

Total monthly revenue stayed roughly flat. CasterHQ did not need a growth story. They needed their advertising to stop costing so much. 64% less ad spend, 13% more ad sales, $9,400 per month back in margin.

How the Flywheel Works

CasterHQ connected Astra in February 2025. First full managed month (March 2025): 7.4x ROAS on managed campaigns. By April 2025, DIY spend had dropped from $15,000 per month to under $500. Astra took over 87% of the total ad budget. Results were immediate.

Fix the targeting first

The DIY campaigns had 2.6 million impressions per month at a 0.32% click-through rate. Most of those impressions were wasted. Astra cut impressions 42% while increasing clicks 44%. CTR more than doubled, from 0.32% to 0.79%: the clearest signal the right products were being shown to the right buyers.

Better signals earn lower costs

CPC dropped 75%, from $1.74 to $0.44. Amazon's ad auction rewards relevance. When CTR and conversion rate both improve, Amazon interprets the ads as useful and grants better placement at lower cost. Astra's improved targeting generated the signals. Amazon's algorithm delivered the reward. Astra also shifted budget toward product targeting campaigns, which carry lower CPCs and reach buyers already further along in their purchase decision.

42% fewer impressionsStopped reaching audiences who would never buy

+146% CTRMore than doubled: the remaining impressions reached the right shoppers

$73 to $16Cost per ad order, a 78% reduction

The Results

Metric	DIY Baseline	With Astra	Change
Ad ROAS	1.9x	5.9x	Tripled
TACOS	12.9%	4.9%	62% reduction
Monthly Ad Spend	$14,760	$5,368	64% less
Monthly Ad Sales	$28,023	$31,726	+13%
Monthly Total Sales	$114,356	$108,570	Revenue held steady
Click-Through Rate	0.32%	0.79%	More than doubled (+146%)
Monthly Ad Orders	202	327	+62%
Cost per Click	$1.74	$0.44	75% lower
Cost per Order	$73.19	$16.43	78% lower
Margin Recovered	N/A	$9,400/mo	~$280K over 13 months

The Takeaway

CasterHQ did not need a growth story. They were already doing $100K a month. What they needed was for their ad budget to stop bleeding margin. Self-service plan, no managed service, no agency. They connected Astra and got 5.9x ROAS, 64% less spend, and $9,400 per month back in the business.

Over 13 months that margin recovery adds up to roughly $280K in incremental ad sales compared to what the same budget would have produced at their prior 1.9x efficiency. The business did not grow. It stopped wasting.

Spending over 10% of revenue on Amazon ads? That is your margin, not your cost of doing business.

CasterHQ was at 12.9% TACOS before Astra. They are at 4.9% now. Start your free trial and see how much Astra can recover from your ad spend.

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