If I make 10 scans in a month, I've ~paid for my share. I'm still interested.
I'm curious about usage patterns by those that have a drum scanner. is it something you use every week, every month, every quarter....? I'm guessing that I would continue to make low-res scans for selections, and then make hi-res scans once or twice per month of the final selections of images. That would probably be about about 2-4 images / month.