I don't self vote comments but I think it is 'ok' for minnows on good comments. I don't like seeing big accounts self voting themselves up to the top as it detracts from a lot of the smaller accounts. The worst I saw (not value-wise) was for a competition run by @kpine for accounts under 40 rep where two dolphins hijacked the top positions. It is very low class.
I do think bumping up a bit might be okay but again, that takes cents to get above spam, not dollars or hundreds of dollars.
Yes cents will do the trick.