Why you sale your gambling site?
I think he do not have enough funds to make it alive in real mode, I can say like it because he is now joining an ICO bounty which I think almost impossible for real gambling site owner joining in such bounty.
I don't think anyone would pay a huge amount of money to buy a new dice site that is still in Beta mode, it would be better for the admin of this dice site to improve your site and increase the players base before selling away the site, as that will surely attract more people to consider buying this dice site.
Obviously, no one will be interested to buy it because there might be some serious bugs on the script. I doubt he will improve it, he will just sell it with the current condition.