Site looks like a very easy way for the owner to earn a couple of bitcoins a day from suckers that come on to the site. I wouldnt recommend it
You can really win. You have almost 50% chances of get back your bet. And a bit less to double. It's like all the betting and gaming websites like other webmasters presented on this board. I don't know what my website are less than this websites.
Edit: To prove my good faith, I have up all bet multipliers. Almost 50% to double your bet. What else? I still scam people? (like all the betting websites on the Internet in fact, and all lottery in the world).
You're really in bad faith, if these websites give you a problem, don't go on them.
