I like this idea. Personally, running my own vault once in a while, to prove to myself that we have something that will someday work in the real world, is valuable and important. However, I don't need that confirmation on an ongoing basis.
It is important that we have a stable network for developers and others to play with, that is not vulnerable to sabotage by short-sellers, governments, and wanna-be hackers who mistake their ability to sabotage an incomplete network with evidence of their hacking genius.
I would trade community run vaults for a maidsafe run, invitation accessible, alpha network, since that arrangement allows maidsafe to harden the network on their schedule, rather than the schedule of some random script-kiddie.
If we want to do some community run test networks occasionally to test any hardening or NAT traversal that maidsafe has chosen to do on their own schedule and not an attackers schedule, I'll be there with bells on to run it and help test. Until then, an invitation token style alpha network with all vaults run by maidsafe would be my preference, so we don't slow down development.