Yeah I definitely agree in this, maths can help when it comes to sports betting and some card games (poker). As far as slot games go.. I wouldn't trust any system when it comes to that! Roulette and black jack i only play at land based casinos.
Personally I do find that maths can help you in rather restricting yourself from gambling because one who knows math will quickly realize that winning against a house edge is almost impossible and in the favor of the house. Apart from that maths I cannot think of any other way in the helping of a gambler, yeah sometimes it can be good to calculate parlay bets and sometimes to do arbitrage.