Right, but how much of those good feelings are due to their continued beneficiary status?
If Michigan, Ohio State, Penn State, and the SEC powers broke off to form Prestige Worldwide, I guarantee that Northwestern and Mississippi State would feel the same way about those blue bloods that the I8 feel about Texas. I live among and am close friends with many Iowa fans. They absolutely hate Ohio State and Michigan despite the financial security afforded them due to their association. Every big dog is hated by whoever is below them in the pecking order.
Texas didn't leave the Big 12/USC didn't leave the Pac 12 because of how the other schools viewed them. They left because of concerns that they wouldn't be able to compete at the top level without the financial benefit of being in the SEC or Big 10. In the NIL world, you have to maximize your revenue to compete at the highest level, and they all made extremely rational choices to that end. Same as the schools that left the Pac 12 for the Big 12.
The conference model has been the source of a lot of that resentment, IMO. Eliminating that would go a long ways in changing those dynamics.