Since we decided to open Human Connection for public registration, we
don't need to create artificial shortage of signups. The original
intention here was too:
1. Grow the network slowly and under control
2. Create an incentive for users to invite their friends
Point 2 is now obsolete, everyone can signup herself. Point 1 is based
on the (seemingly) wrong assumption that there will be a "run" on the
network if we open it for public registration. Our growth was fairly
stable so far.