when you compare speakers at an audio dealer, will that comparison hold up in one's own stereo system ? maybe.
it is possible that while you might prefer speaker a over speaker b during a dealer demo, you might prefer speaker b over speaker a with your own components.
Let's get practical for a moment. I took a quick look over at AudioAsylum. There were roughly 1,200 models of speakers by around 300 different manufacturers. Using your logic, I would have to drag each of them home (or at least those in my price range) before I could reliably dismiss them from consideration.
Lets say you're looking for a pair of speakers in the $3000 range. There's a ton of 'em.
By your way of thinking, I will have done myself a great disservice unless I bring each and every candidate into my own listening room and give it a trial of weeks or more.
That, my friend, is impossible. I dare say that precious few full time audio reviewers have heard more than a fraction of the available speakers on the market in their own listening room.
As a practical matter, we all have to make judgment calls regarding which of the many available speakers will make the cut for our final selection process. At best, if a person gets two or three speakers into his home for an evaluation, he's done pretty good.
To think that I'm going to bring home 100 different pairs of $3,000 speakers for audition isn't going to happen. And I'm not going to look down my nose at anyone who winnows down the field with judgment calls at a dealer's showroom. I also certainly don't blame any dealer who restricts home trials to serious candidates.
It would be interesting to see how your selection process works. How do you eliminate the non-serious contenders? I find a dealer showroom demo gives me more useful information than advertising copy or a flowery review, whether professionally done or from an online contributor.
I don't buy that you're bringing "every" possible candidate, so you're eliminating them somehow. If you haven't heard them yourself, that leaves appearance, published specs, reviews, reputation and not a whole lot more.