I fully understand your point about the money. To a certain extent I agree but I do not agree with those that believe (not saying you) that this is JUST about the money. Even though this showed up in the 60's, we are still learning about it and figuring out what works and what doesn't. Heck, we don't even know how or if it is serious to humans yet. When asked about all his failures in making a light bulb, Thomas Edison said, "I have not failed. I've just found 10,000 ways that won't work." We're still figuring out what doesn't work.
BTW, if you look at the TWRA website, it says "the TWRA is funded largely through the monies generated by licenses and permits purchased by hunters, anglers, and other outdoor enthusiasts." The operable word is largely. Direct taxpayer monies are used for the rest. And if you think about it, licenses and fees are like a self imposed tax by those who participate in the activity - a user tax so to speak.