Pennsylvania could become a leader in online gambling, but a high tax rate could kill the idea before players can place a bet, say two advocates of Internet gambling. “People won’t invest proper marketing dollars to drive revenue if the tax rate’s too high,” says David Licht, executive chairman and CEO of All American Poker Network, which operates an online network in New Jersey and has an agreement with Mt. Airy Casino, Monroe County, to set up online gaming if Pennsylvania legalizes it. “If the tax rate is exceedingly high, the operator is going to take that out on the...