I'm pretty sure this was the case about a month ago. For at least a couple of weeks, @wang was making over 6k SP/week when he was still voting at 14 mins. Ever since he cut down on his upvote delay, the bot game has been a lot more challenging for everyone.
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See my reply to @jesta. Not only is this a matter of increasing competition but also structural inflation. The rewards are getting effectively smaller, by design (until a floor is reached but not for quite a while).