There's still risk but it did turn out to be good which it was actually an easy money or profits for those who had able to buy.Its just a waste that i had missed this one too.
If you say there is still a risk, can you explain what kind of risk? because I read their offer is very attractive and guaranteed post 30 days, they can resell to Rollbit.com at the original purchase price. I think this is very fair to NFT buyers because as bad as they can get, it's just 30 days waiting for them to resell and receive the money they previously spent. And nowadays, Rollbit is one step ahead of other gambling sites.
For having a successful casino running for sure there will be a demand created for this matter and for sure the existing whales of rollbit will provably participate on the sale they are conducted so I expect that Rollbit will be successful in their NFT sale since we know how good the Rollbit casino is and also the current marketing campaigns they do just to promote their sale will help them be notice by those NFT collectors.