Different reasons.

One time, I got a new Mrs & didn't want her going over my old posts. Another time, I wanted to distance myself from some drunken rants I'd posted. A couple of times, I wanted a fresh start & all that, but it's only a matter of time before someone points the 'you again' finger (anything between 1 & 3 posts) so I've give up on that now.

Also, I like building up green blobs - a bit like Lego.

I've decided I don't like the name Deus Ex any more, so expect another change, sometime soon.