Honestly at this point, those who are interested in hiring 2 line sitters should really look into pairing up with people who want to wait in line and see the show, and pay for their tickets in exchange for their wait. So, if two people wait for four tickets, and then the two who didn't wait pay for all the tickets, it comes out to $354 per ticket for them - way cheaper than hiring two sitters, and the two fans who waited get to go for free!
I know this was already discussed, but I just wish there were a way to publicize it more because I feel that those considering hiring 2 sitters, or bringing a line sitter to the show with them if they just want one ticket, have probably not thought of this as an option.