On Products, wasn't the amount of votes supposed to have some effect? According to the wiki, it doesn't:

I think also voting for a bug in Bugzilla should increase karma. After all, if a bug doesn't get any votes, it would appear as the bug doesn't exist. On the other hand, if there are several votes for it, a fix might come sooner.

And finally Discussion. For some strange reason I have no karma for it, although I have posted few times in maemo-developers. Not much, but it should show something anyway, no?