There's a far bigger difference between California and its neighbors: housing costs and availability of housing even for those with money. I have known many well employed people in my town that have not been able to get an apartment even after applying for upwards of 20 apartments. When paired with application fees, that means that these people spend $500-$1000 merely on application fees before they finally get into an apartment.
That awful situation doesn't happen in Montana or Nevada, as far as I know.