You should've said "How much for the
TRIMMED Yount's?" and see what kind of reaction you got
Could've been a memorable interaction.
In all seriousness, if you feel that a dealer is selling fake or trimmed cards I think you have an obligation to make your opinion known and hopefully have the cards removed for sale at regular price to save them from being sold to a less knowledeable collector...
I recently saw a man at a flea market selling fake Jordan's and I asked "How much for the Jordan RC?" and he honestly answered "Actually they are reprints..." and I respected him for not trying to lie about them. As a matter of fact, I went on to explain to him how they were counterfeit and not reprints and the subtle distinction between both...