I've had folks back out after telling them what I thought my item was worth in cash, seems people value their items higher than others.So a guy with exactly the trade you are after changes his mind because of the value? Ok... if you say so. It is a fact, it will not cure every conceivable scenario. Just the majority of them.
It's OK, you can be wrong too even using fewer words. It's actually preferable.
Who would have thunk it?