They’re collectors items. Some AT ships are average too… but when there’s a limited supply the price gets high. PL is betting on the same thing… otherwise why bother invading the worst null-sec space in the game? Sov warfare isn’t enjoyable for anyone… if you do it you either want the space or want something you can get from the space.
NCPL didn’t invade Providence for fun. People roam providence and blow their crap up for fun. I don’t think anyone enjoys the process of fighting for sov.