Jorge - I agree 70% is not just unfair but should be illegal. As for the mom & pop shop comparison. Most gallerys schedual their exhibits at least a year in advance and work and planning for that artist begins then. They are more often than not located in the more high rent areas of a city. ( the landlords see to that once the gallerys start to move in- a good example of this is Chelsea area of NYC where ten years you could have rented a space for under a $1.00 per mo. per sq foot and now can not touch a space for less than $4 -5.00 psf. ) There is no worse feeling than sitting in a gallery empty of clients, with work on the wall that is not selling and knowing that $10 - 15,000 rent is due in a week. With most gallerys 1/3 of the exhibits they hang are what are called lost leaders. Shows that are expected to loose money, but are necessary to display to either support local artists or the present the gallery as a serious exhibit space. Artists have a choice - they can show in the gallery or not, they can open their own gallery by themselves or w/ others. I have yet to show in a gallery where I have not gotten the $ I felt my work was worth. If they wish to tack on 100% and can sell the work, why should I care? Artists have a history of not understanding the market vakue of their work which is why gallerys, reps and professional auction houses exist.