Sports gambling is not known for attracting bright people. Bright people are known to stay away from such activities.

I assume you think they're not smart because they're doing something that causes them to lose money?

I don't see why this would carry over to @Steemsports and betting on Steemit, since with these you win and take no risk while you play.

A problem gambler isn't really that attracted to this, because there isn't any rush or real amount of money on the line.

The people who might join because of Steemsports are people who like ways to earn a tiny bit of money for no real effort, or who are into sports and think it's cool. Maybe you could make sweeping generalizations about those groups and their intelligence, but the typical junkie sports bettor isn't really even the demographic who gets pulled in.

By the by, it's possible to be an advantage sports bettor. The house is interested in dividing the action evenly and making money off of the juice. It's not inherently unbeatable like most games, it's more like trying to trade stocks profitably, if you have better information than the market you can win at it.

Point being just that it's really tough to make broad statements about everyone who does X activity, because there are a bunch of different reasons why people might do it, and for some it probably is a really high intelligence that gives them the illusion that they're smarter than the market price. If there's any subset of gamblers who "aren't bright", sports bettors are one of the last ones I'd pick. First would go to slot machine or state lottery players.