Well first make sure there inv. is empty my making them pickup enough items to fill their inv. eg. mundane potions (not stackable) So if 1 or more are left they have something else with them
mcdonlds in rhen gate the price to get in should be let's say 200-350 and prizes should be diamonds diamond armor or 2x the price to get in
k how about $250 an entry and $150 of it toes towards the prize. eg. 4 players enter thats $1000. $400 profit and $600 to the winner.
using the fishing spot at spawn have them kill them selfs in a town next to spawn so you can watch then give them a fishing rod