I'd have to see a breakdown of statistics to see if they were the largest abusers. :P But personally, I think $600 payouts should be reserved for EPIC posts.
I got a $300 curation from currie for the first chapter in my book. I really don't know if it was worth that TBH, but it caused me to continue the story with fervor, despite never getting a payout anything close to that for the following 14 chapters I've now done. SBD was $11 at payout if I remember correctly, so I'm fine with some chapters earning less than $1 even, and others getting $10 or $20. I hope by the end that people will see it as undervalued, but I honestly don't even know.
After writing some of those chapters for multiple hours, and feeling like I was going to bleed out of my eyes after writing some of them, being utterly exhausted, and literally pouring everything I have into them. Even with that, I honestly don't know if it's really worth the rewards I've gotten from it. I can't imagine how people feel entitled to insane rewards for things they don't pour their everything into.