Don't you reckon if they are already caught doing something illegal that not being able to purchase a once a year piece of paper probably ain't gonna be much of a deterrent anyway???? At least we are still getting some of their money once they have their privileges reinstated.
I mean if you loose the privilege for a year or more, you didn't just make an innocent mistake. And taking their license is not going to stop them. "Oh crap fellas, I can't go poaching with you, I don't have a license. I won't be able to go with you for a couple of years. Ol' sheriff Prater caught me and took me to the Judge and they yanked my privileges for two years. Next time he said he'll take them forever! Sure don't want to get caught poaching without them!"