How many times can u visit a hifi store before it annoys the store if u plan on a purchase

Are they opening the doors just for you or is it normal business hours and they are sitting there whether you visit or not?

If the latter then don't worry about it.

If you chew your gum loudly, just once. If you eat your noodles with your mouth open, you will get kicked out right away.

Having customers come in and audition is part of the audio business. I think it is perfectly ok to shop. What is not acceptable IMHO is to go audition at a store and negotiate a better price with a competitor or buy on line afterwards without giving the opportunity for the store to price match. 
A case in point. Today I am getting a new pair of speakers from a store I visit for over ten years. I auditioned many speakers there over the years but never found what I wanted there. I had the opportunity to get the same speakers from a store in another city at a lower price but preferred to stay loyal to the store manager who has always been very helpful and who will provide service if required after the purchase.

We only have one high end store here and I go there about once a year to listen to a couple of their rooms, but for some reason they just don’t sound good to me.  I mean an all Boulder system with the top of the line Transparent cables, a couple of different speakers and it just sounds okay.  I’m pretty sure it’s the room(s), yet  these guys have been in business for years. They probably know who I am by now, but I don’t care. I went in to ask about DAC’s and one of the owners pulled out something, said it cost $67K and I just chucked. I never asked the brand name, nor did I ask him to demo it.

ghdprentice is right.