I've always wondered about this. The real expenses are disk space and bandwidth. I don't understand how they can't just provide a space-based plan (oh yeah, that would cut into high margins).

It's a wonderful service and they've done so much to keep many open source projects from stagnating. They outshine SourceForge and Google Code by a large margin. Still, if BitBucket was git, I might migrate my stuff.

The thing is "social coding" isn't that big of a plus for your own private stuff. I definitely see value in a service like this.