Whether it's rare or whether it can be bought are two different things entirely. Rare things can be bought; it happens all the time, take this thread for an example. I think rare bootlegs are probably pretty common (is that statement ironic?
) in that the bootlegger makes a couple copies and then sells them for $500 a piece and he's done. In fact the rarer the better. If he was selling 100 of them, people wouldn't be paying $500 a piece and that's what he wants.