Which I find endlessly annoying. Already paying for the service, being required to buy ad hoc almost everything I want to watch is a source of repeated annoyance. Our response is to just say "Oh forget this, screw Prime", exit and switch to looking for something on Netflix, PBS, or whatever.

If it was the exception for new hot content, that'd be fine. But it seems to be the rule for the majority of content, even if it's a decade old. So, we hardly go there anymore.