you are bound to get plenty of money
Certainly not. You need to "win" 4 times at 0.125 per round to break even.
Also, with the source not up for inspection there is no way to know if this is a true random lottery - or biased in a manner favourable to the developer.
(Who could take the site down and walk away with the remainder of the prize-pool at a time of his choosing.)
Do not want.
Not one bit.