I've never quite understood the allure of these texture and model packs. Why would you fill your game with media that thousands of others are possibly using? Doesn't exactly provide for an original experience.
Funnily enough no one minds when it sounds in games, or indeed video in television and movies. TV and movies are full of clips they've bought from other shows/movies, but it doesn't seem to bother the average viewer.
But not that it matters, most people that buy this stuff never use them in a finished product, or maybe I've missed something.
This is true. I think it's because of the subject matter. For some reason, almost all of these content packs seem to be designed for a medieval fantasy rpg, and since the vast majority of those never get finished, the media never gets used.
On second thoughts, perhaps it's not "for some reason". Perhaps these artists start off developing them for a game which never materializes so they bundle em up and see if they can get a few quid for em. That would explain why they're all in the genre which most often fails.
Personally I'd like to see a lot more such packs, but more varied, instead of just the same bloody inns and fantasy rpg weapon sets over and over. I'm not a great artist, but I can do enough to make something look different without entirely lousing up the quality of the original.