I consider tournament prize as a potential cash when playing so that I can enjoy without focusing on the rewards.
But maybe it is due to the low prize pool so those high rollers are not that attracted to participate in the tournament.
Good chance for small to medium players to take the opportunity in the tournament, at least if you can win something from the tournament then it can be something like money back when you are losing but it can be an additional money if you are on profit.
I'm checking the bombay weekend tournament which is also a wagering tournament and it seems that currently not many players are opt-in.
Maybe because it is 3 days tournament only which has just started and high rollers may come in the last hours to beat all the current players