Affordable vs. ultra expensive speakers - what's the difference?

I think there is a difference but not sure if 50K difference.

Engineering and materials mostly. 50K may be a lot to the average person but perhaps for some it's not that much. If the expensive loudspeaker is not in your budget, does it really matter?

Consider yourself blessed if you honestly ask yourself that question…

For your next two cars, buy $30k cars instead of $50k cars and you've got an endgame speaker with the savings.

Ok, that's a bit of a dumb comment, but given what people spend on cars, Starbucks, etc. the money spent on things that last a lifetime and used everyday are truly valuable. No one second guesses their purchase of a good kitchen knife, right? Same principle.

I gotta think on this one.. 

No comment.

That's rare!! :-)

Put the less costly speaker in the best acoustical possible room for it and put the costly one in an ordinary room..

You will have your answer...

For sure the high  probability that the costlier one is better because best designed  with more qualified component  is there...The price margin is huge here...

But no speaker at any price can beat the room anyway say a famous acoustician....

i will trust acoustic over any difference in price .... Save if this low cost speakers are really bad...