This isn't so much a fetish as a weakness!!!!
I am one of the most competitive individuals you could ever wish to meet. I will not be beaten!!!
So any game.... Any gamble is difficult to resist. The odds could be against me, but so long as they are not impossible I will give it my best.
An example is a game I used to play with a Mistress. I had to go out in my lunch hour, buy a pair of ladies knickers and wear them. I then had to give Miss a choice of four colours that I had chosen..... If Miss guessed correctly I had to pay her 20 pounds (about 30 dollars). She would write down the colour she thought on a piece of paper and I would turn up at her house..... She would show me the paper, then I would show her the knickers I was wearing!!
It was very exciting..... We played that game lots!!
So not a fetish as such (although I enjoy wearing ladies underwear), more of an addition to challenges!!