I don't know why this show was canceled.
Look at what was #20 on Entertainment Weekly's 20 Dumbest TV Shows Ever. Contestants try to contort their bodies into cutouts in a foam wall or else they're pushed into a pool of water. Canned by Fox (what's new?) faster than, well, any other inane reality show on Fox. Please, please watch this gem of a clip I hyperlinked above. It's the Australian version, but the accents make it all the better. The contestants realize how absolutely fucked their buddy is.
"That's not a bananar, that's a T." No shit, Aussie! Thanks for the laugh, indeed.