Well how about if people go on gebx's side then it would split the bet between them. For example, if I joined with gebx and we lost then we would both get a 6 week ban(with 12 people on the PS3 side for example) and if another person came in then it would be split between us 3 if we lost, in this case a 4 week ban for all 3 of us. If we won then it would still be the 1 week ban for all the PS3 people.
That way gebx wouldn't have to assume all of the risk counting on the 360. I believe that it will outsell the PS3 in NA for at least 3 of the 4 weeks in March too and I'm willing to enter in on gebx's side. :)
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3." 
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"
