Something like the one in my signature? Maybe not 'like' but exactly? I came up with this idea before FreeBitco.in added the lottery features as seen from 'jacktheking' post history. I only managed to publish my site in mid last year. I know I am not the person who come up with free lottery idea but .. just sharing.
Anyway, it is not hard to manage since the revenues is split between users and owners neatly. However, as someone who is doing this, I can tell you that I've yet to break profit. I am paying about 10 USD every year for the domain. So 1 dollar per month for the domain. And my host is SteadyTurtle and I pay about 2 USD per month. Together, about 3 USD per month. Not to mention about advertising.
I only take 10% of the total revenue. Which is ... about (or sometime lesser than) 1 USD.
However, I've a feeling that as long as I continue, I will break-profit one day. Feel free to build a site similar to mine and compete with me. I like competition. Who know? Both of us might be earning a lot of Bitcoin one day due to our competition!?
See you!
Edit: I'd say I spent a lot of Bitcoin in donating to the lottery pot, advertising, giveaway and hosting before I could make it to where it is today - 1 USD per month (still losing 2 USD monthly though).
I found that website moments ago, it looks like the idea has been done before but I don't like the way they did it. You have to gamble your faucet to be given a lottery ticket, that's not the same as a faucet lottery where the prize is funded by people viewing advertisements. Their website is essentially the same as having a lotto in a chat which most casinos do if you gamble a certain amount. So my idea in my opinion at least is still pretty different. I haven't seen how you've implemented it but it doesn't sound as if it's going well for you. If you are taking only 10% you're doing it all wrong. Remember this is free. So it's not unfair if you take 50% which is what I would do. Getting 1,000 advert views generally means $10 profit. Take away $5 for the user who wins.
To the users saying I'll have to spend a substantial amount on advertising: that is simply untrue. Giving away something for free doesn't require a lot of advertising, and members can advertise it themselves with a simple referral system. I'm gonna guess I can expect to pay around $10-25 a month for advertising, no more than that. Then when we have at least a thousand players playing in each lotto we don't have to worry about advertising anymore because it will already be very profitable.
EDIT: Sorry I have mistaken your website for "freebitco.in" in the above post, please forgive me. I was talking about that website. Yours actually looks good, but you're still giving away way more than you need to.