An interesting, and appropriate question. In reading through the replies, I have to agree that I have run into a few audio salespeople who “knew everything”, and had no interest in answering my questions. I had also agree with the “80-20” rule cited above. At a CES Show at McCormick Place, many years ago, I was fortunate to speak with Richard Vandersteen about how much more money is required to have a small improvement in a system. So while I agree that are those “sales types” in the industry, I would be remiss not to cite the “Great Ones” that I’ve had the good fortune to find and deal with. Eric Lang at Salon 1 Audio in Ormond Beach, Florida, and Taylor Everhart at Goldprint Audio in Lexington, NC. The most receptive, understanding, honest and helpful dealers that I have encountered in 40 years in this passion. I also need to mention the great folks at Rogue Audio. Always willing to listen and help, the aforementioned folks are some of the “Cream” of the industry. Allow me to extend a personal “thank you” to these folks, and offer to all who read this post, speak with these folks and you won’t be disappointed.