It will take a little more while to attract rollers, especially high ones. But surely it will come. It is also best to take note of some suggestions on this thread. I hope there is a dev here who collects the suggestions and apply them as they deem necessary. This forum has a sterling track record of promoting dice sites into huge success.
But the way, the highest number of online rollers that I saw was more than 30. For a dice site with barely a week of existence, not to mention the fact that there is a tight competition on this niche market, it already is a great start. More will come.
It always takes time for young sites to catch attention, and grow up with more users, and more bets. The site has some good advantages, at beginning, beautiful user-interface, and good promotions (maybe the team might consider more diversifying promotions, if they have enough funds). There are some complaints about smoothness (lags) of the site on mobile devices. If there are some issues with the site, not users' internet connections, it should be fixed and improve user experience on their mobile devices.
I have one point to suggest, the background color of the page for FAQ, Term, should be adjusted a little bit darker. Current color looks a bit bright and a little bit harder to see.