When spam is removed, do I get my down ticks back?
If not, then it is not worth down voting a spam question.
Reputation is not (usually) automatically recalculated. So you won't see your score increase after the question is deleted. If you look at http://www.stackoverflow.com/reputation you'll see your "real" score, which will properly account for the deleted question (you'll get your points back).
If you want your reputation recalculated, email email@example.com or flag your question for moderator attention and ask for a recalc.
Be advised that recalcs will also remove points for upvoted posts that were deleted, so your score might actually go down.
From the meta.rpg.stackexchange post:
Flagging is the way to go!