I've wondered about low-sum acquisitions commonly celebrated on indiehackers/build in public... I thought they were often likely scammers in some way, like using domains with traffic for then nefarious purposes? But maybe not, maybe this is just a way to avoid the dozens of $0 projects on OP's list, and the buyers sincerely want to grow. Navigated to a few OP sold and they still seem to be what they were.
For many people, building out these projects feels impossible to avoid. Selling them on for almost anything at all gives them: some amount of cash, the positive signal of achieving a sale, and also clears headspace otherwise occupied with "I really should do some work on idea #3487."