Most burning Snape question?

[pippin_999]

No: HPFGUIDX 107547

Laura:
> > I've already decided I'm asking her a question on Snape as 
not many  people ask good Snape questions ... This is what I've 
got so 
far:
> > 
> > 1) Is Snape a pure blood?
> > 2) Why did he join/leave the Deatheaters?
> > 3) Has he ever been married/engaged?
> > 4) Will he ever get the DADA position?
> > 5) Why did he flinch in GOF when Lucius was named as a 
DE in the  hospital wing?<<

Steve:
. By the way, that question was
> asked and answered; he's not. So, please... please... do not 
ask if Snape is a vampire.<

Pippin:
JKR's  answer was only definitive if you think her hand wasn't in 
the cookie jar. <g> But I agree that it's as definitive as we're 
going to get, short of Book Seven. So I'd ask

"Can you tell us why Snape never eats at Grimmauld Place"

If the answer is something like, "I can't tell you, but clever people 
have already guessed," it won't settle the debate, but it will prove 
that it's a clue and not a Snave. (Evans, spelled backward. Like 
it?)

JKR has already said that teacher marriages are classified, so I 
wouldn't ask about that. 

Pippin
who thinks that the "Perseus Evans" anagram is another Snave