It's that one guy... the incentives are pretty misaligned. Because he is popular, people upvotes him, regardless of the trash he posts, because they think it'll get them high rewards.
His spam covers up a lot of actual quality posts so the upvoting bots are disincentivized to go through posts and actually find them (due to smaller rewards.)
I myself have muted this idiot and hope others do the same.
RE: THIS IS JUST NUTS, WHERE IS THE QUALITY CONTROL ON STEEM