If Frank gets hired away, it is going to be to a school that isn't worried about how much it costs to get him*. The only difference the buy-out amount makes, is how much KSU will get when Frank gets hired away.
*Miami is the exception, but $1M is probably enough to keep them away from Frank, imo. Not sure if they would pay $750k if Frank is still in the top ten in 2 years.