500 hundred tickets would be more fair, both from the issue of your profit, and the chances of winning. $75 is alot for 0.05% chance of winning. I doubt you will get 2000 sold.
considering i mined most of mine at sub $2.00 per
BTC i think its a more than fair gamble. everyone compares to fiat currency when it shouldn't be. that's bitcoins main issue at the moment. everyone is tying it to usd. also the reason every worldwide currency is currently de-stabilized.