B.C.
Multiple accounts gives you the chance to have multiple personas.
You can be a total jerk or spill embarrassing secrets or be a troll and then be totally reasonable and respectable with the other.
Kind of like having an imaginary friend that you can blame for all the naughty stuff you had a hand in.
I'm not organized or creative enough to pull something like that off.
I do have an imaginary friend though.
His name is Larz.
He sort of resembles Fabio and he exists to worship me - I can do no wrong.
If he's good for nothing else he's an incredible boost for my ego.