OP, you're trying to get big in a saturated market. There's a lot of predictions available online and many people just go with their gut or bet on the fighter they like instead of reading what someone else has to say. Try it if you want but your chances of success are low.
I doubt that he will pay too on this contest even if he was not ban.
No one will ever trust him because he has a bad reputation in the forums, he is too pushy to promote his contest even if he has to use another alt account, no guarantee he will pay contest winners unless he uses a trusted escrow service to hold the winning funds, but there is no point in thinking about that and only wasting time. I remember there was a newbie account posting a high bet for his chosen MMA champion and influencing other gamblers to choose the same champion, but his choice was lost and he has lost big money.
Makes you think why he wouldn't change his name and start with a clean slate when his reputation is tarnished. That's what altcoin scammers are doing all the time. Altcoin fails? Change name, change team, get some fake pictures and you're off to another project.