I guess as usual this will come down to porn. if those apps get rejected despite being non-malicious that shows how this "notarization" process truly is.
To be honest, it's not even like I care that much about the additional payment. Scummy but expected. It's more that the current prices, similar to Unity, seem to pretty much punish any innovative idea that takes off, to a point where Apple will not just make the product unproftiable but bankrupt the developer in the process. Most mobile apps are free so people underestimate how quickly you can hit 1M. At least make it something like $0.05 at a million and ramp it up at 5m or 10m to these larger prices. by 10m downloads you are much more likely a larger business or have figured out a way to properly scale your app.
oh and don't count updates, discouraging devs from maintaining their apps. Devs don't profit from an existing user updating, why should Apple?