Richard,

I don't know about customers reacting to Canon's 30 year inks, but they sure react positively to my Epson's 100 year inks and use of archival quality matboards and mats. The more people get to know about inkjet printing, I expect them to be more concerned about archivability.

Frans Waterlander
pixographer

When doing the better art shows, you are expected to hang an artist statememt that states your print process.

The price you sell your photographs for has no relationship to the archival materials you use because it's your choice. The customer is expecting the best, no matter the price.

I host a forum of over 2500 photographers who discuss selling at art shows. That would be a better place to ask your question. But you will get the same answer as here. You need to create good work if you expect it to actually get into a show. Always use the best materials and price your work to make a profit. There are ways to do it properly. I start at $45 for an 11x14 matted 8x10 on Fuji Crystal Archive paper and tell anyone who asks about my print process.