I attended the Boston Comic-Con Saturday and was taking to a dealer friend who specializes in Golden, Silver and Bronze age comics about these picky customers he had.
They came to his table looking for silver age books in the 9.0 range. Out of several books they looked at,there was a particular issue of THOR - he had 3 copies, all in the 9.0 range and they were picky about each one, and the nicest one had a small penciled in arrival date in the "T". I think he said the book was in the $75.00 range.
Now, this dealer has been doing this for 40+ years, (and doesn't believe in "Slabbing") is one of the old timers who's good with grading and has good prices. He was also having a bad day in sales. (poor location in the room)
Well, after dealing with these nit-pickers for about 20 minutes looking at these issues, and a couple of other books, he told them point blank that "Look, I am about selling comics to folks who are collectors first and not obsessed in the investment value of comics, and you can take your business elsewhere."
When he told me this part of the story, I was impressed! A person having a bad day sales wise, turns away a potential customer because they were to picky and only cared about quality and invenstment, not content or the joy of collecting!
That my friends is someone who truly understands what comics are all about.