From what I understand, what happened at Peters Valley was that he wanted to teach a photoshop class because he was doing "something that no one else is". In any case they do not have enough computers to arrange this type class.
As far as his inkjet prints go, I have a Paula Chamlee poster that's just as nice and it only cost $35. I think clicking a mouse should bring down the price. $900 bucks for an inkjet is out of my range. For 450 you could have gotten a Pt/Pd print from Tillman Crane and his book in a special slipcase edition.