I sell mine with selected prints, understood before the transaction takes place. After that purchase I put those selected prints and a few others online at da Smug. They have paid and received agreed upon service and prints beforehand. If I think some would look better with a bit of embellishment I also put them online with the rest, in a blind link. They can purchase extra or family can purchase prints from the blink link. I make a little extra when and if they do. A built in backdoor sales system I do not have to mess, worry or toil over. If they want mugs for Gran or mouse pad for uncle Joe, there they are. I do nothing and collect on top of the original sale. Anything after my original sales is profit I do nothing extra for. Sometimes they chose a larger print format than I had arranged for but, I receive email notice from Smugie and a bit of this and re upload for that print. Large family or business get togethers I sell the initial set and service and put those plus the rest online with a set price per print. I don't plan on profit from those extra sales, but if they purchase from online I make more trouble free money.
If in advance I know there will be so many purchased online, I figure half that expected volume and price accordingly to make them and me happy.
They will not look as nice as the prints on the original sale. I plan it that way. The side sales look nice almost like the original but not exact. They know that before. I explain that my printer does work not often found. Sometimes they order extra prints from me and I use my printer for that. They have been printing longer than I have been taking photographs.
I pretty much have all angles covered.
I don't dinker price or have fear of being told I charge to much and they think they will use someone else. If they are polite I am. I thank them for there time and let them know I'll still be around should they find they need my service. If they are cross lipped, crinkle headed, cheese weenies abbot it.. I thank them for there time and continue on my widdle way.
It's not a perfect system but it works for me and when it all comes down to it, that's what matters.!
My business model, or someone elses business model may or may not work for someone else. The work is finding what will or will not work in the area they are in.
Smoke and mirrors and if there happy they'll leave a bit of coin. Make them happy enough and they will return for more.