Developers shouldn't have to spend $100K to get into the top 10 of an App Store. For whatever reason. That is money that Apple would much rather see dedicated to making better apps.
If a developers are willing to spend $100K or more there are always going to be lots of ways they can artificially push up their ranking. How does it make sense to target specific instances of the problem instead of trying to make the associated techniques less effective overall?
Suppose AppGratis successfully transitions to a newsletter / web app model instead (and all the "big bad Apple" publicity is probably helping with that), is the impact on the App Store that much smaller? Or does Apple just have fewer options to respond with?
Developers shouldn't have to spend $100K to get into the top 10 of an App Store. For whatever reason. That is money that Apple would much rather see dedicated to making better apps.