I’m still new to all of this, but I thought a salesperson’s job is to sell. Not everyone is chomping at the bit to lay down big cash (and from what I have seen, if you are considering equipment on Audiogon, you are looking to lay down big cash), so the salesperson needs to ask enough questions to determine the seriousness of this potential buyer and what he/she is looking to pay. Whether the OP’s approach was sound or not, I think that is secondary to the need of the salesperson to do their job and see if a deal can be had.
Personally, I have not gone into any high-end audio stores because I know that I am not going to spend tens of thousands of dollars on a system, let alone one piece. And, as dill advised me, I don’t want to waste a salesperson’s time that could be better spent with an eager buyer. That, and I don’t want to hear any equipment that leaves me feeling dissatisfied with the equipment I can afford.