Yes, I would say that this is a fair correlation to make.

Of course, those who are just having some genuine fun might pick a slot machine that they like, or throw some money on a roulette wheel...though if we look at the house edge or EV, we know that Poker is a game where you can potentially gain positive EV based on your skill and Baccarat has a low house edge compared to other table games. On the other side, slots and keno usually have the largest house edge, ans sports/horse racing a susceptible to fixing. If someone is seriously playing the latter in the pursuit of winning, while the former options are available to them, then I believe that it is fair to say that this says something about their intelligence.