I'd do it if it were reasonable James. Here's the problem. It won't ever be my definition of reasonable.
For a deer lease here in GA I pay $1000 per year. That's reasonable to me. I'm not going to shoot a 180 whitetail there, but I go to hunt and try and get what is good for the area. If I still lived in Texas I'd be willing to pay more for a year round lease, but I won't be hunting next to the King Ranch either...
So.... If I'm going to pay big money I'm going to go to where the animal(s) are native whenever possible. And, I want the sight, sound, and smell of africa, as others have said. I love Texas and some areas look similar to places in Africa, as you're well aware. Both places are dear to my heart, but they are different.
Let me shoot a $500 cull animal and keep the meat and I'm interested. Other than that though, not really.