Yes, I have noticed many people self upvoting. For some I can see it how it makes sense to do so when they are getting a dollar or more per vote... Why wouldn't they upvote themselves.

I usually don't beacuse, at the moment, it's pointless because of the value of my votes.

The people that do though, have a much larger investment in steem than I can afford. The way I see it is that they should be able to gain some interest on that investment - if that is achived through self upvoting , so be it.

I imagine the complainers are more than likely jealous because their votes don't have the same effect for them.

That said though I do think there should be some sort of cut off point to prevent the reward pool getting rapped too badly.