I have never felt anything about gambling. Most boring thing ever. I don't feel anything about investment, and wrote automation to track mine because it's all so boring.

I wouldn't tempt fate to try to expose myself more, but it doesn't seem like I contain whatever is required to form these addictions.

Has it been studied if some people are just much more vulnerable than others, and are there predictive factors?

Yes. One interesting example is that compulsive gambling is a side effect of a certain class of drugs for treating Parkinson’s disease.

https://parkinsonsjournal.com/en/parkinsons-disease/gambling...

I like alcohol and trying new things, whether that be food or languages. I get nothing from gambling. Not all stimuli affect everyone equally. You’d need something approaching a unified theory of consciousness to adequately explain this finely.

I feel the same way - it's just not fun for me. I like playing poker with my friends, but I like the social aspect of it - putting down $20 on the table is no different than buying a few beers at a bar, and I don't care if I come out of the game with more or less money.

Going to a casino, which I've done a few times, is just wildly disinteresting.

But I know I'm prone to other sorts of addictions, so I guess gambling is somehow different.