Low investment and good money for the pople that love virtual t-shirts and dolls I guess.
Buser told Gamasutra that console gamers have been very receptive to the virtual goods business model since Home launched in beta form in December 2008.
"… I would say that it is a very good business model for PlayStation, and quite profitable, I might add. I like to say it's one of the highest-margin businesses in the games industry."
http://edge-online.com/news/playstation-home-model-%E2%80%9Cquite-profitable