2. Currently, there is the free Lambo tickets promotion again. So freebitco.in wants us to make 30 free rolls in two days. But why? For a casino, it would be better to give us incentive to play. Example: Do at least one Multiply BTC bet per day and get one Lambo ticket for this day... and the promotion runs 10 days. I looked for SEO optimization, they guess that recurring visits gives you a better Google rank. (Google doesn't make the ranking algorithm public, so SEO is a guess) But freebitco.in does not use Google Analytics. But maybe the Captcha service registers the recurring visits for Google? (Or one of the many other Google website services)