Both Saban & Meyer have made and continue to make fortunes as college coaches. They likely have more money than they could ever possibly spend, so is a couple extra million on top of their current net worth really that big of a deal?
I think it has to be about a desire to be at Notre Dame. If they don't have that, I just don't think offering them a couple million more than they currently are making will cause them to leave their current gig, which for both of them, is a good one. If either has the desire, it wouldn't take a record salary to convince them to come.