Because it is pointless. Internet is full of roulette system sellers promising everything. Someone interested in roulette would understand what I am talking and he wouldn’t need any warranty. I grow up in society where man’s word means more than any contract. Any buyer of my system has opportunity to communicate with all the other buyers and until now never happened that someone complained. Roulette computers, kinds of visual prediction are only tools, nobody can give you a warranty that you will win under conditions you face. If someone does, he is probably trying to scam you. You can read more about roulette scam cases at forum.