well, your new lottery site does not have any proof that you are not taking huge cuts from the pot. people are putting their money and buying the lottery tickets which they can do at any site even on faucets like freebitco provide lottery feature. but if you provide an innovative way with the lottery system then I guess people will consider trying it over other famous sites.
well, nowadays its very hard to find some sites that have significant different to another. Even some of themhas just give additional method of the lottery.
Not only the participants, the owner of the sites of course want more profit than just from the ad of their site