What about this sport...

[broiler]

The current payout structure on the telecasts are 25k-13k-6k. I'm not sure if it would be possible to bet enough with the low bet maxes to make up for the possibility of the bowler winning more by just winning their match.
The telecast money doesn't take into account any ball or other incentives that the bowler might have for winning the event.

The low amount of action on the event would probably make it pretty obvious that something fishy was going on if someone was throwing a match. Pinny was the only place I know that offered a line, so it isn't possible to spread the action across 5 books to hide what is happening. I guess it comes down to how many times would Pinny take one-sided max bets before the line comes off the board.

[B00T]

it is next to impossible to figure out if someone is throwing a bowling match on purpose

[broiler]

I realize that it would be nearly impossible to detect an attempt to throw a match. The betting action would have to point directly at that situation and even then it might still be hard to tell. The main point is that it might not be financially reasonable to throw a match under the limited betting situation that existed.