Originally posted by Ash there's nothing legal that can stop such sales
Most developed countries have Trade Practices Legislation. This, and my own conscience, would be enough to discourage me from selling current model goods at multiples of their new price.
You'd want to do your own due diligence, but as an example,
Australia's TRADE PRACTICES ACT 1974 - SECT 51AC(3)(e) provides for a court to consider:
". . .the amount for which, and the circumstances under which, the business consumer could have acquired identical or equivalent goods or services from a person other than the supplier"
Interestingly, legislation like this is often written to protect the mis-informed buyer and mis-informed seller. I'm sure PF members would never take advantage of a person mistakenly selling their K50/1.2 for $40, thinking it was a K50/2.