Well nab the whole new thing of 50GB is just insane. Come on, it cant be that hard to lower it. Nobody stays on the mirror where the small share is. It is, was and will always be empty, caus nobody is gonna stay on there. And I seriously see no point in subdividing the hub into 2 parts. It just spreads out the very thin layer of users even more since some cant get in. I mean, i would rather let someone with "only" 20 GB of good stuff to share in, than somebody who has got a k@k-load of useless stuff in his share. I had a mere 30GB last month shared, but my upload in total is so far 5GB vs 4GB download. That taking into account that I was only on for a few days.
In my mind, the best way to do it, is let everyone join, and see how it goes. Maybe there would be more people, and at the end of the day everybody would be happier.