I agree. But people pay real money to buy virtual land, property and widgets and rent virtual properties in SL. WoW has a slightly different model but land still has a real money cost. The VR "economy" was worth an estimated $500 million last year. And growing at 15-20% per month. And that's not Linden, that's US dollars. There are many who've given up well paid professional jobs to make money in SL.