Market signals

Best-seller rank (BSR) of top 3 listings 5,000

Lower = more sales. Top 10K = strong demand. Top 100K = niche/dead.

Average sell price ($) $25

$20-50 sweet spot. Under $15 = thin margins. Over $80 = slow turn.

Avg reviews on top 10 listings 500

Under 500 = beatable. 1k-3k = competitive. 5k+ = entrenched.

Product fit

Weight + size category

Smaller = lower FBA + freight = healthier margins

Seasonality

Brand presence in top 10

Restricted category?

80-100: Go for it

Strong demand, beatable competition, healthy margins. Move to deeper supplier and keyword research.

60-79: Worth deeper research

Decent chance but with friction. Find a wedge — better design, niche keywords, lower price, bundle.

40-59: Risky

Likely break-even or worse. Only if you have a strong unfair advantage (sourcing, brand, capital).

Under 40: Walk away

Either no demand, brutal competition, or impossible economics. Better ideas exist.

Next steps: