My understanding of the situation is that it has nothing to do with Facer itself but rather how Apple manages the AppleStore and who can sell on the Apple Store... Buying a watch face on Facer is not exactly the same as a "in-app" purchase on iOS. As such, Apple cannot fully control what is sold...
But I might be totally wrong.
Anyways, this is how I managed the situation myself.
I know it doesn't really solve your problem, but it works well. And it works well for more than just Facer...