Right, but creating additional revenue is difficult when costs are so high. I don't know what the solution is. I guess the best one is to just make a multipla

Right, but creating additional revenue is difficult when costs are so high. I don't know what the solution is. I guess the best one is to just make a multiplayer game on the basis of continuing to sell and support it for years at a stretch, like Valve. But that limits what kind of games you make, and would also put you in direct competition with Valve. Which... is probably just as bad as not doing it in the first place.