Ron Burgundy
I look good...
I think it goes back to there is just no need. If an alt is being used for humor, then why not just post it under one name. The only reason I can see using an alt is because you are being such a jerk that you don't want to "sully" your main name, you are trying to get around a ban, or you are wanting to fake fight between two accounts.
Personally I don't see any of those as valid reasons for having multiple ID's. I can't speak for HD, but that is my take on it. If you have to hide behind an alt to say something, it probably doesn't need to be said![]()
They do it to annoy people... and not risk their main account being banned.