Upload & Sell: Off
Just want to add that my costco has been customizing my proofs with my copyright info and filename on the back for at least the last five years. They output from a Noritsu calibrated to sRGB. I check the "don't manipulate my photos" box (which defeats the brightness reprocessing). Done. Not one complaint in 5 years and clients can order larger prints using the filename on the back, so there is no guess work. Since the costco is across the street from my house, most clients are impressed at having their proofs 24 hours after the wedding.
If you are a member, it is well worth looking into.
They also output large format from an Epson 7880, with 20*30 prints about $9. Printed on Fuji pearl, these prints are, quite frankly, indistinguishable to the untrained eye from the same fine art prints I charge $175 for, from my own 7880.
Profiles downloadable from the website.