I get very little real spam (abuse from harvested addresses). I use throw-away addresses everywhere. If one gets harvested I throw it away. I forward all mails to gmail and their false positive rate in spam detection is well over 50%. I cannot see that clicking not spam improves the situation. Well, I don't know how much they would classify spam if I'd never clicked it.
From some experience this seems to not always consistently work. If people don't explicitly whitelist me I'll often start showing up as spam years later.