@evan @ted As it stands I'm kind of an odd example. I'm only a maintainer on one (mostly) unpaid project and I'm also the only maintainer. Most of my unpaid contributions to other projects are just one-offs, though the number of projects I've contributed small amounts to is quite large (it includes things like libpng, libtiff, FreeBSD, Linux (though now I am paid for that and my contributions have skyrocketed) and a significant number of other projects I'm forgetting).
Said long-term project I've been working on for nearly 13 years but I've done less and less work on it over the last 9 of those, after having burnt out. As such, I don't really have opinions on those questions. But I also have refused to start new projects as this project still isn't what I'd consider feature complete and I don't want to further split my attention.