I would say it depends on the product and how you perceive the sound. Is the improvement meaningful to you and do you have the proper system to take advantage of a higher quality speaker?
How much "more" for how much more $ ?
I know this may be a cliche question, but I was thinking about a new way to ask it. Even if I had infinite means, I'd still want to be cautious about how I invested in my audio enjoyment with respect to speaker purchases. Seems today like you can get a lot of serious bang for the buck in the 5-6K range, especially for an average-sized room. I'm just wondering what the extra 9K would buy you. Is it just more "hi-fi" or is it a serious upgrade in sound? Or could it be something as simple as the pleasure of exclusive ownership since these would be out of the range of what many people could afford.