Well, you could say that for whatever game you're talking about cash is more desirable for the things you can spend it on than time or skill. In most games with political systems, for instance, only skill in getting people to vote for you will get you office.
The other issue is that people don't tend to look at their leisure time in terms of dollars per hour. Few people are going to fill up all of their potential leisure time with money-earning work because it's generally viewed as less pleasant than playing a game, for instance.
--matt
|