As a data point, which I don't think is a huge outlier: I have paid $5 for lots of apps I like, which I would never ever have gotten around to paying for on someone's website -- partly trust, partly just mental overhead. But whether the app is $4 or $6 makes zero difference to me.

I don't think I found any of these through their listings or search, maybe those could be better? But the space is huge, maybe random blogs etc. can do better than any centralised store.