I collect comics, which are (printed, yes, but) art made by people. Sometimes I'll sell off a run, some I'll keep forever because they're fantastic. Different strokes ig.

It definitely can be, for example art is very often hoarded as form of investment, and this can be a much lower-price form of the same, but not necessarily. I would say the more those things price is, the more chance for hoarding.

That is, economically. If you mean hoarding as in psychology probably it's more depending on person, a lot of people i know including me were collecting more or less useless things but nobody i know went into true hoarding problem and most of those people at some point got bored and got rid of their collections. Other than above personal experience, idk.