If anything, for the last three weeks, I've been commenting more (which I understand to be posting as far as the system is concerned), publishing posts about the same, but voting more.
However, over that period of time, I wouldn't say I've seen an uptick in rewards, because others need to at least be voting. And while the big accounts persist with their SP and their bots, I think it's the middle SP that has dwindled a little bit, since I don't see a whole lot of large minnow to dolphin-sized votes.
Or maybe they are there, it's just that they too are delegating, or trying to spread their vote out as much as they can to help encourage as many people as they can.
Lots of us smaller minnows and plankton doing our diminutive best to roust the reward pool, though. :)