I think some people are conflating looking up recent sales (knowing what copies have sold for in the past) with trying to leverage that information in a dishonest (or unreasonably fashion.
Some people might not be ok with the former for a range of reasons (such as the fact the person did not do the work in advance, the fact that you have to wait around while they look it up etc) while others have an issue with the latter (using only the lowest sales examples when buying and the highest when selling etc).
I generally don't mind waiting if something needs to be looked up (although if it is not a real priority I'm telling them not to bother and moving on).
The latter is my issue and that is the case whether they look up the info on the spot, or do so before the show.
In general as my collecting focus has gotten more niche (WWII baseball, Integration and lineup cards primarily), I find less and less relevant items at shows and that has driven down excitement for them.
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