If your handle gets sold by some facebook employee to a rich kid in LA, what recourse do you have? I don't know what laws this would break (maybe some broad definition of fraud? I Am Not A Lawyer) so it's not like this person has a slam dunk legal case...
We have no external arbiters of online interaction, no well-respected third party we can go to to arbitrate. The last defense is the mob, potentially shaming the companies in question into recanting. I've seen it happen on this very website multiple times. But it is not sustainable, it does not scale, and it allows the companies to keep fucking with people who can't make their injustices known.