In fact, staying on high stake slots are not good luck for me. Sometimes it causes me stress. So, I lean towards penny slots most of the time while playing. In the case of roulette, always I limit my bet from 10 cents to 10 dollars, it gives me so much joy and doesn’t have the fear of losing lot money. 
Some people get the most out of their sense of risk. For example, they wager a large amount of money and get the adrenaline rush of realizing a possible loss/win. Your game strategy is good, but it won't work for those people. Maybe there are many such people among high rollers.