Business School usually get paid very well, even assistant profs are paid $140K, full prof can get $240K.
Whereas full profs in science can only get $170K, assistant profs only get less than $80K unluckily.
So a finance assistant prof is really paid much more than other profs.
http://news-service.stanford.edu/news/2006/may24/gifs/salary.pdf#search=%22salary%20info%20for%20professors%22