You're assuming that the supply and demand of dresses is balanced, and in particular that any particular dress will always be in demand.
You're right - you can keep a dress forever and it's not on the website. That's not really what I mean by "out of the system". Dresses need to be able to come out of the system because they go out of style, or get too used, and nobody wants them again. If I'm trading dresses and then get stuck with one, in a way it's still "in the system" and clogging it up. I can't participate until I buy back in again.
On the other hand, I already can't really remember why I blamed the virtual currency for this particular problem, so you're right about that, too. This problem exists when you use dollars, too.
You're right - you can keep a dress forever and it's not on the website. That's not really what I mean by "out of the system". Dresses need to be able to come out of the system because they go out of style, or get too used, and nobody wants them again. If I'm trading dresses and then get stuck with one, in a way it's still "in the system" and clogging it up. I can't participate until I buy back in again.
On the other hand, I already can't really remember why I blamed the virtual currency for this particular problem, so you're right about that, too. This problem exists when you use dollars, too.