We do too have software that can be that reliable. A aviation and space flight are quick examples. Gambling houses probably don't want to pay the cost of that software, but it could be done.
It wouldn't just be bookies paying that cost. It would be forwarded to the customers placing bets. I'd prefer to keep the costs low, since nobody is going to die and things aren't going to blow up. The worst that will happen is someone thinking they scored a huge payout and not getting it.