Texas State Parks

I can understand Texans defending their State Park system, as any good citizen should, and as I do as a resident of Missouri, but IMO Missouri has the best park system and has been used as models in other states. Missouri passed years ago a 1/8 of 1 percent sales tax for the state park system. That allows the state to not charge entrance fees and maintain the parks as well as acquire new lands, and keep moderate camping fees. My concern in Texas is the entrance fees and tourism. We are planning a trip to Texas in a couple of weeks, and as I assume many other people, would like to visit several state parks and possibly a couple in the same day. I was told when I called the Park system that a entrance pass was good only for that park and no other. This can really eat into ones budget. The yearly pass is a waste of money for us as we can only spend 5-6 days in Texas. $70 is tough to chew in this economy for 5-6 days of sight seeing.
I also realize that many states have the systems and prices will vary. It's just hard to get use to.