Once a fortnight I get together with a few mates and we play 5 bucks per person poker. so the winner gets about 50 bucks, which isn't really much in the grand scheme of things. But that 50 bucks makes a big difference, it makes sure people don't be stupid and go all in for no reason etc.
In the same way, awarding 50k isn't too much money, but it is enough that teams will try to pick the right team, and it is not too much money that it would be worthwhile throwing a game just to win that 50k.