I think you can, however, expect payment in kind, i.e developer time. If someone is marketing an improved version of my code, I think they do have an obligation to provide their source as well. Hence the (A)GPL.

I guess if "Pay in developer time" is part of the license, you could expect that. Personally, I always use MIT and hence I expect nothing, even for people who use my software to earn themselves money :)

Yeah, and that's why I can't imagine using those licenses. It's an open invitation for free riders into a system built on mutual aid. It costs you nothing to open source code, so it's the very least you can do as a user of open source code.

I definitely understand your point of view. It's hard for me to justify restricting my open source work like that though, as I associate "freedom" with "do literally whatever you want, I don't care". I've myself have built businesses on open source code, and wouldn't want to stop others from doing the same either, even if they don't contribute back code.