Oh jeez, it makes no sense to tax those who breakeven, it ain't a win.
At this rate, it could backfire and their regular collections could decrease. Whenever I see a high/unfair tax imposed on something, a lot of peeps don't usually quit. Instead, they turn to alternatives like in this case, I'd say off-shore casinos—those shady and not. To make things worse, reputable off-shore gamba platforms would typically ban USA, thus locals would be in an unsafe situation.