David I just can make a good report on marketing fine art prints on ebay. For sure for unknown photographer like me , price is low but it keep correct. For the moment I can make a living selling my photography on ebay, it takes time to have collectors but it is the easiest way I find for the moment.
The best thing on ebay is that you can advertise your work for not much money.
Get in contact with serious collectors.
Being free of selling what you want .
And direct contact with the collectors.
There re other photographer like Georges Provost and Luca Paradisi who also sell nice work on ebay. I am also a original print buyer ad collector and find ebay to be a great place.