I pay $100/yr to keep a few free apps (no in-app purchases, no ads, no commercialization attempts at all) in the App Store. I get emails all the time from people who want to buy the apps and ruin them.
I've been doing this for about ten years.
Now, my development time is worth a lot more than the accumulated $1000. But it's free time, and I volunteer it.
I also recognize the value of $100/yr as a "bozo filter" to Apple. But every year when they auto-bill me, I read the email and think about how it also excludes lots of good people from participating in iOS development.
It'd be great if there was a "NCA" class of app. No commercialization allowed. Always free, never ads, no in-app purchases ever. If all of your apps are NCA, your developer fee would be waived. This is probably too complicated for an Apple product though. :) And I think alternate App Stores or side-loading would be a net negative for the platform. So I pay.