Why review count decides whether people buy from you
On Eldorado.gg, buyers filter by rating and feedback count before they look at a single listing. A profile with no reviews isn't judged harshly so much as skipped — there's nothing to go on, and twenty other sellers on the same page have a track record.
That's a cold-start problem: you need sales to get reviews, and reviews to get sales. A review package breaks the loop by supplying the social proof up front, so your listings compete on price and stock instead of on how new your account looks.