Well, believe it or not, I didn't pay that bot and have no idea who paid it. I don't know anything about @gentlebot. Shouldn't you be able to see on the blockchain if I paid for it ? Or maybe, by looking at timestamp, even what other account paid for it ?
I do use self-votes myself when I deem that the effort I've put into writing a comment deserves a payout, even small, and am not sure anyone else will upvote my comment. I've also used minnowbooster to indirectly pay random user to upvote my comments. Overall you may say that I'm experimenting with the Steemit system, taking it out for a ride.
The fact that I've tested features and decided to use some because it's how the system, in its current state, is supposed to be used, doesn't imply that I believe all its features to be good. :-)