Why don't I want to buy expensive things from gambling winnings, because I bet not to buy things.
I bet only for the pleasure of my soul, so whatever the value of the win I only use it for fun.
I have principles in gambling, my money is at stake, the money wins the bet, the bottom line: I have to distinguish between gambling money and my own money, I mean my steady income, so with my principles like that, I bet a bit calmly, lose or win, not having any intention of buying expensive stuff, I spend it for fun.