I recently found this thread and don't find it coincidental that the person who started it is no longer allowed on the forum. This is not a "professional" question nor does this person have an understanding of what professional photography is. Let me give you an idea of what I just did recently for a client that I adore:
-Many back and forth emails about what they were looking for and rescheduling due to availability and weather
-Test shoot to ensure I was understanding what they were looking and was ready to ensure I could deliver
-A quick editing round to post online proofs
-An in home proofing session to make sure I understood what she wished to order
-A few back and forths to finalize pricing/desired order
-Back and forths with printers to research an exact treatment they wished for
-Another editing round to go to order
Now, do you see why we would charge a minimum of $25 per image that we capture? It is not about the cost of the paper/print. It is about ensuring you take the time to capture images that the client loves and therefore values and ensures you an income. My thought is if I haven't captured an image that you love, then I do not deserve $30 for it/I have not done my job.
It was not until I ran my own business that I understood the cost of running a business and could therefore try to help clients understand this. One friend told me she thought her wedding photographer was "too expensive." I asked her what she thought the photographer needed per wedding to ensure she could make a living? What do you think a photogrpaher needs to spend just to keep their equipment up? I know even the smallest repair or piece of equipment costs me a minimum of $50.