You got it backwards: they are asking for in-game name so they can check their past chat logs and/or current "reputation" (there's an in-game system that allows

You got it backwards: they are asking for in-game name so they can check their past chat logs and/or current "reputation" (there's an in-game system that allows other players to give you reputation rewards). Once you get the job, you could simply create a new account to do whatever you want. Using it to get a competitive advantage for yourself wouldn't be very smart though, because you would have to sign up with your real name for an event if you want to make money from that. The best option would be to sell advantages to other players, like boosting their ranks or unlocking in-game goodies.