I have been building a plugin for Obsidian commercially.

I messaged @kepano about being able to support paid plugins. Apparently they can't because of Apple App store rules that forbid third party "stores" (and/or require a cut of the payment). IIRC there was a ruling that walked this back a little bit, but only in the US?

One thing I've appreciated about Obsidian is that they have donated to the top plugins as voted on by users each year. It's a small amount (eg. $25), but it is a nice gesture.

Micropayments could also be a nice gesture, but I don't think they could add up to meaningful income for a developer. There are enough developers that are willing to build great open-source plugins for free. IMO the missing tier is having quality (and vetted) plugins that people can work on full-time.