Granted I don't do this, but if you're concerned purely about money, then you aren't paying $60 per game then keeping it. Renting, buy it and sell it a week later, wait for price drops, etc. You may not get as many games per dollar, but if somebody wants Gran Turismo 5 for example, then they don't really care how many games they can get for the same price if it isn't what they want.
Same thing with how many hours a game is. Do you go into a theater and choose a movie based on its length? I suppose the origin of this is the fact that a lot of children play games, and they have limited funds, but large amounts of free time.







