Each entrant presents an additional administrative cost. You need to be able to judge all aspects of the application, in addition to the location costs, support

Each entrant presents an additional administrative cost. You need to be able to judge all aspects of the application, in addition to the location costs, support costs, etc. When offering a prize of this magnitude, you need a way to filter entrants such that you don't have a trillion apps to judge, and ensure that those that are entered have a reasonably accurate view of their relative competence. $99, while offensive to you, will probably do the trick.