Glyfair
Explorer
I agree somewhat. However, those saying they are completely different are missing the point just as well.It's a matter of functionality and people who view them as the same are missing out on the key aspect.
Some PDF customers buy PDFs because they want that format. However, some PDF customers buy them because they are cheaper.
I am an example of this, at times. I purchased Blackdirge's Dungeon Denizens as a PDF because it was about what I was willing to spend. I would slightly prefer a print copy (much more useful to me). However, the difference in price was significant enough, and a monster book is one of the few books I can tolerate in a PDF (because I don't need to print out the whole book to make use of it).
To ignore that a retailer is going to lose sales because the price of a PDF is much cheaper than a print copy (especially because of an additional special discount) is a mistake. It happens, and probably often enough to be a concern of retailers.