Due to this restriction, most of the US people are not gambling, before gambling before we have to research about the website and their credibility because there are some fake websites which they will not pay withdrawals on time. So we have to be very careful when dealing with gambling websites.
I think you'll find a lot of US residents get past the restrictions using VPNs. There isn't actually any need for us block US IP addresses. Playing dice with Bitcoin isn't breaking any federal law and your individual state laws aren't applicable outside the state.
You're right about reputation, we've been around for over 5 years and built a good one.