Was also a favorite of mine back in the 1980's when the mid-60's tough hi numbers were priced way too low.
This would be the typical conversation:
Collector: How much do you want for the 1967 Shaw/Sutherland Card
Me: $20 (or whatever seemingly insane price I wanted)
Collector: But Beckett says it's only $7
Me: Here is the phone # to the Dallas Office, buy it from them
Collector: But the book says this.
Me: How long have you been looking for that card to finish your set
Collector: 3 years
Me: Don't you think there is a reason you have not been able to find that card then at that price
Collector: Yeah; but I still want it only for $7
Repeat conversation about 10x a show
Rich