Burnett isn't always healthy. Hell he wasn't even healthy all of last year. They both make the same amount of money, Matsui is better than both Lind and Johnson, and Stairs doesn't even play everyday.
Why the hell would we trade a high end prospect for a guy making nearly 30 million the next 2 years and won't make 30 starts a year?
EDIT: BTW, The White Sox just got Carlos Quentin for Chris Carter.