if you sell it for a dollar, that's all you get. this site makes the money it tacks onto your price, along with accessories, and tuition to be on this site. a customer buys your work, you don't have to do anything but post a stellar piece of work, that is free of noise and isn't stretched. they send it to the customer. you get paid. done. you can only post 25 images, until you pay the $30 then you can post what you want. but you have to do all the advertising.
you have to work that out with the person you go to. he would have to give you the files. but scanning works well too, and with a stitching program and time you can make your own image. we print at about a 100dpi for the largest size. to make a 72" print, you need at least 6200px. to make a 36" you need 3600px or so.
---Mike Savad