Aliases usually step on their own dicks by checking in at the same time, responding under the wrong name or having a similar posting style(punctuation, spelling, CAPS, wording, etc). I'm smarter than the average dumbASS SO id b ablle to work round IT!!! but having more than 2 would open up the possibility of responding under the wrong name to an extent. I could probably run half a dozen, with the understanding that I'd never post under 5 of them. As my worlds are the best, I wouldn't accept my own aliases into them.