When it's no longer available sounds reasonable to me as an artist myself. Unless the company is very evil like EA. In that case, it should be acceptable from the get-go. And bonus points for pirated DLC or getting it before the official launch.
Personally, though, there are games no longer available and I've pirated that I'd pay for, like FFIX, while there are others I've bought when I really shouldn't, like Diablo III. So yeah.







