Missed this topic when it was actually posted. That's some nice calculations you made. These numbers looks nice on paper, but math doesn't always works in reality. If it would be just about maths, I had to win $200 at least 4 times - I'm rolling on Freebitco.in since 2015 and still haven't rolled main prize. Well, maybe one day. Hell, I haven't even got $20 so far, while maths says that I had to get it $20 8 times.. I also got $2 reward maybe only once or twice. P0robably I'm the most unlucky Freebitco.in user, considering how many rolls I have made. While probably there is users who had to make few hundreds rolls to get $200 or $20.