If you feel the content is over-rewarded, that's your choice to make.
I'm sure I could find worse, see @raindrop for example. I'm getting a little tired of defending Mark - he is an easy target due to his activity/visibility but others are taking the absolute piss right now, and it's been like that for coming up to 2 years.
I'd be surprised if Steemit inc centralise downvoting like palnet/steemleo, I do like what's going on there.