Everyone should pay the same tuition. This would promote competition with colleges from other states so students can choose an out of state school if it has a better program.
When I first came to California as a Marine, I was not eligible for in state tuition. Illegals residing here were.
Since then, service members are eligible for in state tuition. I am not certain about their spouses and family.
People who live within a certain range of the Nevada/Arizona border are eligible for in state tuition, I believe.