The $$ depends on several things - geographic location, patient mix, disease mix, but most importantly, how much you want to work. The derms who make the big bucks work for it -- seeing 60-80 patients/day on general dermatology days. Cosmetics is not as lucrative as one would believe, unless you do large volumes of it. MOHS got raped this year with the removal of the multiple surgery exemption -- I now collect as much on general derm days as I do on the MOHS days because I do not make people return for reconstructions. Dermpath still pays well.
I'll say it again -- don't go into it because of the money, for we are all one short piece of legislation away from being on a level playing field. I have a friend in general surgery (lives across the street from me) who actually works fewer hours than I do and pulled in $50k better than I did last year. Sure, he takes call (1 in 8 and no real trauma), but his lifestyle is actually better than mine (he can have a few beers with friends most of the time while I am "on call" for my surgical patients 7d/wk). I'm not complaining b/c I rarely get called, but it does put a damper on festivities.
The days of MOHS being a lock for $500k/yr ended in December 2007....