I have voted ++ on some pretty dumb questions if they happened to be questions the answer to which I wanted to know. It helps if the question elicited a good answer from a real expert who has carefully crafted and tested that answer, which will probably get a ++ also. Or a good sharp-pointed sarcastic answer I haven't yet heard will sometimes work, too. Sometimes I don't vote ++ where something deserves a ++ if I don't understand it.