The people who have money to invest can go for forex, even they have other options means stock market, investment in gold etc. to utilize their capital. But most of the people go for forex why?
Do you mean why do regular people (without other investments) trade forex?
If so, I would say because you can start with a very small amount of capital and potentially build it up over the years. Alot of people see fx as a 'get rich quick scheme' though. I would venture a guess and say that's why a large percentage of people experiment with fx.