Digital Makeover

Nothing new, in the world of glamor photography beautifying the models is part of the show. Knowing that I judge all the slimming adverts in our newspaper by the creativity and the skills of the PS artist. But this pimp-my-picture seems to be a common request, and customer totally underestimate the effort. I frequently get the request to remove things, polish walls in panoramas.
I always feel like cheating, but what can I do ? Maybe it would be easier if a customer would appreciate your work and accept your quotation.
Sample (guess what is before-after)