They don't disclose but, I did read an analysis from when he was flirting with the Kansas job that made it sound like Harbaugh is making Brewster money currently. Now, as I said, grain of salt thing cause I can't find all the links. One is included just below.
As for why Harbaugh might come here. Two things.
First, he only (I know, only) makes 1 mil a year according to speculation I've read and at least one site called Coaches Hot Seat
http://www.coacheshotseat.com/JimHarbaugh.htm
Second, look at the psychology of the guy. This is a guy who took the first head coaching gig offered to him, despite the prospects looking grim, and the fact that other better jobs would have come his way, and then went 29-6 the next 3 years. After that he took the Stanford gig.
While at Stanford he did the following things:
--6 months before he coached a game there he publicly claimed Carroll was leaving USC after the following year. Not only did he say he heard it from Stanford's staff, but he refused to walk away from that statement when Carroll became angry publicly.
--At Pac-Ten media days that same summer, he needled Carroll even further, sarcastically proclaiming that, '"There is no question in my mind that USC is the best team in the country and may be the best team in the history of college football." Harbaugh and the Cardinal went on to beat Carroll that year as 41 point dogs
http://en.wikipedia.org/wiki/Jim_Harbaugh
--When RichRod was hired at Michigan, Harbaugh was pissed he didn't get the job. He took the opportunity to say publicly, “Michigan is a good school and I got a good education there,” he said, “but the athletic department has ways to get borderline guys in and, when they’re in, they steer them to courses in sports communications. They’re adulated when they’re playing, but when they get out, the people who adulated them won’t hire them.” Remember, guys who played for Bo just don't say that stuff out loud.
http://michiganzone.blogspot.com/2007/05/jim-harbaugh-disses-michigan.html
--Against Pete Carroll last year Harbaugh shamelessly ran up the score, going for 2 after Stanford's 7th (!!) TD to try to get to 50 points. When they got the ball back he made a point of passing downfield and then scoring again to make it 55-21. Afterwards Carroll and Harbaugh had the following exchange.
"What's your deal? What's your deal?" Carroll said, according to two sources near enough to hear.
"What's your deal?" Harbaugh retorted, and that was that.
http://articles.sfgate.com/2009-11-...nford-defense-stanford-band-mount-kilimanjaro
--Did I mention during his NFL time he once missed two games when he punched TV analyst Jim Kelly in the face?
http://www.highbeam.com/doc/1G1-67853231.html
He randomly quotes Emerson, or Greek philosophers when talking or tweeting about football. This is a smart, highly driven Reckless guy, who has unlimited belief in his own ability, and he has made risky career decisions in the past based on that belief. This guy is also a Michigan guy (he even played for Bo!), who is angry his alma mater didn't interview him for the job. His recklessness is truly impressive--taking the San Diego job, repeatedly going after Carroll before ever playing a game, ripping his alma mater publicly over not giving him a chance, randomly punching former hall of fame QBs in the face.
So here is an overwhelmingly confident guy who knows he can be making more money, a guy who is volatile and vindictive, and just loves picking fights with the biggest kids on the block.
He flirted with Kansas reportedly because they were talking about offering him big money (
http://blogs.mercurynews.com/kawaka...rbaugh-stays-another-day-tiger-takes-a-break/).
If Minnesota could offer him a big salary (2.5 mil say, more than twice what he makes now), and he took it, he would gain significantly financially, he could have an annual shot to torment the alma mater who made the mistake of angering him, plus he could show the world once again that he could take a struggling program and quickly turn it into a league title contender. Who knows, maybe he'll decide he hates Bret Bielema and make a point of ripping him and the Badgers constantly (who wouldn't love that?)
Harbaugh loves to settle scores with enemies he purposely creates for his own amusement, and was willing to flirt with a program with much less upside than Minnesota (that's another argument, but yes I am saying the Minnesota job is much better than the Kansas job, despite the recent Mangino success. (Remember, Kansas has no shot at a BCS conference if/when the big 12 implodes. They almost got left out in the cold this year.).
Money+Revenge+good Enemies+possible folk hero like prestige=everything Jim Harbaugh has ever wanted. The Big Ten also gets more exposure than the Pac-Ten, and Harbaugh clearly relishes the attention.
So, yeah maybe he wouldn't come here. But if you think there's no chance, I'd suggest you consider the personality and tendencies of Mr. Harbaugh.