I'm not taking issue with risk-taking generally. I'm talking about the effect that gambling has on people. The problem occurs when participants care more about the wager than about the game, and pool becomes just another outlet for a gambler's tendencies. It's not a coincidence that so many pool players are branching out into poker now. That implies to me that these are people who care more about the thrill of the bet than about pool as a sport.
Of course nothing prevents people from gambling head-to-head in anything, whether it be pool or poker or archery or coin-flips. Pool's problem is that it has a public image of gambling/hustling/sandbagging etc. that absolutely cripples its ability to get sponsorship, and that image is pervasive among the professional ranks, too. It's very bad for the game to have Robb Saez mouthing off about long gambling matches on ESPN.