The secret to dealing with Richie Muchin is to call first, ask him to call you back when he gets the book out of the "warehouse" or call him back when he says to. Then have him go over the book, give you his appraisal and price, then start negotiating for a better price. I've been buying from Richie for 20 years and have no complaints.
As for Joe Naaca,,,well, 20 years ago it was great, but he seems to have figured out the trends and has priced everything accordingly (No more $10 Hansi's or $20 L.B. Cole covers-(sniff). However, he does OVER GRADE and always has, usually by at least a full grade, and he will not deal on the price (at least, he never did with me, and I try... really... I do...)