I've made this point in the past (though not about this app/company or about payments)
imo Apple made a mistake in resetting app ratings after every new update/release. Developers who release poor quality 1.0 apps benefit from the ratings reset and I can see why some people may see this as a benefit.
However, the two problems I see with the resets are
1. It makes it easier for companies to game the rating system
2. It is a disincentive for developers (of highly rated apps)to update their apps. I'm planning on an update for a recent iPad app. However, that update will reset the 4.5 rating obtained through the 271 ratings received by the 1.0 version of the app in the past five months.