Try it some time and people watch. At best, there's groups of people having a good time. Usually they seemed to be associated with music or convention activity. Mostly, it's depressing, with old people blowing their pensions on stupid slot machines. At worst, there's really obvious criminal activity with people washing money on table and poker games.
The only gambling thing that I ever thought could be good was the state lottery bonds they have in the UK and Ireland. Basically, it's like a CD for lottery... you the interest is a prize pot. But your principal is still there.
The online sports betting thing is gross. My son is 13, and many of the boys are totally enthralled with sports betting. We're creating addicts before they even earn money.