I think a few people missed the mark here (in the sub-comments). The point is, if you're already have paying customers, you will get more. Users looking to download new apps discover them on the Top Paid charts more than anywhere else. The exception is to get featured, but this is a crapshoot. In other words, social proof is the strongest indicator for the long term viability of revenue for iOS apps, and it's hard to be gamed.

So (as others have rightfully pointed out) many app developers solve this issue in their early days by using paid ads...mainly FB ads, as their conversion rate analysis is so ridiculously well engineered. Which means you can theoretically turn off paid search/discovery and rely on on your high position on the Top Paid charts to drive you more even traffic. (Note - Many of them do not turn off paid acquisition channels as they are still highly lucrative anyway)