The big photo printer I use costs quite a bit in supplies.
I almost chose a roll paper printer a few years ago, but decided it was not for me. Besides the obvious cost and size issues:
1. Most large printers don't print on small cut sheets so a second printer is needed, preferably with the same inkset.
2. Choices in paper are rather limited; many of the fine art papers and thicker materials are not available. Paper curl creates certain difficulties.
3. Although ink costs are better for high volume printing, low volume/infrequent use results in losses to extra cleaning cycles, expired inks, etc.
4. Service and repair is typically done on site because such printers are marketed for business use. That would be impractical in my current situation.