I think sony could benifit putting some of their games that dont sell anymore on PC. Example being Heavy Rain, ICO, Shadow of Colossus, Twisted Metal etc. THis applies to Nintendo, MIcrosoft, and Sony. Once a game isnt selling anymore on their consoles they can be used to give them some extra sales on PC a few years later. The only people who care about a game staying exlusive years later, or when it isnt selling anymore are fanboys who wants to make a list rather than playing games.
If i could play Banjo Kazooie, Mario Galaxy, and Ico on PC, id be ok with that. It would also popularize them even further than they already are, specially with Steam sales