I have no idea how this wasnt founded before. There is freebitco.in lottery every single week and they rake like 1btc from every single lottery. They make so much money, we are talking about 4 btc per month, 50+ btc a year. That is more than 90% of people make with just lottery part of their website.
This lottery based on blockchain was expected to happen one day. I am so glad it happened. I am using my exchange so my Money comes through a mixer of sorts so I will be waiting for that to fix before I play but I will definitely try it out.