Private responses from Kevin with bad deals: "Fuck you, it's your fault; I did nothing wrong."
Public responses from Kevin with bad deals: "Hey! I'm soooooo sorry you aren't 9000000% happy with your purchase! As you know, 12,000,000% of our customers are completely happy with their purchases, so again, I'm sooooooooooooooooo sorry that you aren't one of them. Here, let me give you a new sub(or prize money, etc.).
*talking to himself under his breath*
...now let this fucking thing die so I can get back to doing whatever the fuck I want with no regard to ethics."