This post has suffered collateral damage from a 'whale war' between Dan and Berniesanders (who is another whale with many accounts). I believe his main account has a negative rep primarily because of Dan down-voting him. I don't know what their dispute is about.
Voting for your posts seems reasonable for most people (I've recently stopped though), but self-voting comments is considered by many to be voting abuse. There are factions who would like self-voting banned, but this would have unforeseen consequences too. I also have the account @steemreports and develop http://www.steemreports.com, which analyses many of these things.
Thanks Andy. I'll look into those accounts your have...you might be interested in Jerrybanfields post on Steemits top earners.