That's a good pricing structure. Keeps Alpa from cornering the market.
In all seriousness, I agree that flat prize structures distribute prizes to more entrants thus ensuing greater participant satisfaction, however you can't penalize those who purchase a greater % of tickets. You want to raise as much $ as possible for FUDR, thus you have to leave tickets in the drawing. Either that, or you simply make it 1 ticket per person at $10 per ticket. That way no one doubles up and you raise $10 x n for FUDR.