Yeah, his experience at Tennessee has to be factored into all of this.
As a hypothetical, let's say Clawson is making like $4mm/yr right now and Nebraska comes knocking with $25mm/5 years fully guaranteed. He'd clear $5mm more over the span of the contract, but that's assuming no other raises from Wake. Clawson doesn't seem like someone who's going to want to hang it up and retire 5 years from now, but the very real possibility of getting shitcanned by Nebraska after 2-3 seasons means that he'd either have to go back to a G5 school or ride it out as a coordinator, neither if which seem palatable.
This is a really long way of saying that taking a job like Nebraska could lose him money in the long run because he could coach another 10 years at Wake, win 8 games every year, not get fired, and keep cashing P5 head coach checks.
The availability of NIL money at a school like Nebraska does factor in, but Wake would probably beat the shit out of Nebraska right now. We'd probably beat A&M too despite their NIL class. There's also the gamble that there will be no changes made to NIL policy or laws regulating NIL money, which could make this much less of a factor in the future so I don't think NIL is a big enough factor to roll the dice on given his current position.