I quarantine fish with Hypo when I buy them, they can adjust to a lower sg pretty quickly however the acclimatization period is days not hours to bring them back UP to 1.026 with a minimal amount of stress. That's the big issue I see with keeping your Fish Only tanks at 1.012 (I always go down to 1.009 for my hypo though).
I would be very worried about someone buying a fish without realising the extra acclimatization needed, and having the fish keel over when it's put into the tank, then phoning you and griping about it.
That being said, if you can manage a proper qt system (I'm trying to picture your place with even more tanks!!!) you should be able to charge a little extra and guarantee that the fish will be Ich free. There are also some benefits to the fish's overall health by being in a hypo tank while he's under stress.
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