^ Agreed. I think people have misconceptions about the challenges of cosmetics. (1) more demanding patients that can *drain* you (2) dealing with complications on something the patient paid for, rather than insurance paid for (3) feeling more like a "provider" than a "physician" - e.g. you're just there to do what the patient wants. There's also lots of other issues, like volume / competition / setting prices / etc. Lasers are a whole other issue (they're expensive, how often will you use them?, should you rent one? buy one from the company? what's the maintenance contract cost?).
Personally, my practice has a number of dermatologists who are more heavy on cosmetics. I don't have any cosmetic slots for new patients, but I occasionally will do some (botox, filler, PDL, few other lasers) for select patients I see in clinic for other things and happen to mention cosmetic concerns at their visit. This way, I can screen out the high-maintenance, crazy patients (just send them to my "cosmetic" colleagues) and keep the normal ones that I think would be reasonable to do cosmetic procedures on.