Buy a windows game, get the Linux edition for free
Initially I was looking for a way to reduce the effect of piracy by another way of thinking about selling games. I see online gaming much like the board games one used to play with friends and family. Now they wouldn't sell at all if everyone had to pay x dollars per player. The same should affect online gaming. The idea is that one of you buy a game and in the price is included x number of friends. You essentially buy a multilicens.
Now to get more commercial games to Linux you could promote such an idea of multiple licensing among platforms. Hence getting the Linux edition for no extra cost when you buy a windows game. Adding more value and a more fun experience.
What do you think of this idea?