There is no hidden cost, it’s 30% on sale/purchase, like every other marketplace and you don’t pay anything upfront.
It’s a new platform, the problem is that it is probably their new PREFERRED platform, and is of course more expensive than the previous.
But you know what? if you don’t like it, just don’t buy anything from their store.
The problem is that you CAN’T in ANY marketplace sell an app at a different price depending on the marketplace, which means that you cannot avoid the 30% cost just by making your app 30% more expensive,
it means that they do not need to provide you a better service at cheaper cost, since either you accept that or you loose every potencial customers.
now THIS is what we should be fighting for, let me place the same app in different marketplace with different price and THAN we can talk about platform choices, cause right now there are none.