Alter-egos would be bad, people would change their names to other players names and pretend to be them without others knowing differently. (even if they have diffrent tags, they could still walk around as them, and even with the tags, theres only 3 diffrent tags that are used, blue donor, sponsor, and mod, then of course nothing, and I wouldn't be surprised to see mods imitating each other for fun.. Which can get annoying from a players point of view)