First of all; LwMark: The devs are actually pretty active on these forums so don't complain.
Second; The price so pillbugs has been known for a long time. (Check the bug catching thread in faqs and guides). But no one is ever going to sell one. Even at 5k you'd be a fool to sell it. Now, regarding pillbugs, I know their extremely rare spawn patterns, but it's been rumoured that they're no longer in the game. The only way we can know this for sure is if a dev (Dusty..) tells us they are, or if someone has seen/caught one in the last few months.
Thirdly; I don't have a third point to make.