Selling limited editions of prints seems to attrack more buyers. I have seen edi tions from 20 to 100 and higher. Some increase their prices quite dramatically a s an edition nears its end. What are the common accepted practices of limited ed itions? What are the pros and cons? Does the photographer print an edition all a t the same time? I would think that over time, more expressive refinements would present themselves so that the prints at the end of the edition would be the mo st expressive. Can an edition be extended? Why raise the price so dramatically a t the end? Any links or references would be appreciated. THANKS!