The lottery idea is good, and your site looks great as well.
But the way the raffle pot distributed is stated differently in the OP (60%, 15%, 5%) and in your site (60%, 20%, 15%). So which one is correct?
IMPORTANT: ** Prizes were changed from 60% 20% 15% to 60% 20% 18%
http://satoshiraffle.com/ Is the bitcoin lottery.
There are 3 winning places, if you are one of them the funds will be sent to the address who bought the winner ticket.
Once the countdown goes to 0. The prizes will randomly choose and will send to the 1st, 2th and 3th place the 60%, 20% and 18% of the collected funds respectively.
The prizes selection is assign by random.org and you will be able to validate the results with the signature generated by their system.
I hope you guys like it and good luck!
Mr. Ébola