Santa was already banned once and came back. But he didn't seem to be a spammer - just a loose cannon at times.
I already know that Richard can't be arsed because he's told me (in not so many words).
I dont think that sock puppet accounts are that big of a deal, because sometimes people create them to ask personal questions that they don't want their regular accounts connected to. Technically, though, it's against the TOS, and they seem to be cracking down on it.