Collecting Webkinz - Is It an Obsession or a Learning Experience?

My daughter has 1 polar bear webkinz. I really like webkinz, but I'm on the fence about whether or not having more than one critter is a positive learning experience or an obsession in the making. Or perhaps, it's merely collecting, like kids used to do with stamps.

We're getting our other two kids a webkinz for Xmas. We have one computer. That will certainly be a lesson in shared computer time, if anything.