PKR
Veteran
The solution for me, when I operated my business, was to include the rights for the client to make their own prints. Trying to sell paper prints, for me at least, turned into a real pita. And, to be truthful, people demanded the files. Some photographers complained about it but most of those went out of business.
Just one example:
I got hired, several years, to make business portraits from a Mary Kay sales director. It was a great gig. Tell those folks they don't get the files or they come watermarked. Then how do they get the photos on to their business cards, their own web site and places such as social media like Facebook and other promo materials? Ooops, no files, no gig. The banker wouldn't like that.
Window light.
Smiles and fun!
Tough duty:
I deliver prints and files to portrait subjects. It's a little different in that the picture is as much theirs as mine in my mind. Most need files for publication or for the making of bigger prints. I charge accordingly and would rather not be bothered with the print orders unless they are big. They are all referred to an outside source for printing. The only demand is, when publishing (a book jacket photo for instance) my name and copyright notice appear with the photo. Pretty simple. No problems with any portrait photos yet.