What makes an expensive speaker expensive

The price of anything is what the producer accepts to provide that item in quantities the market demands at any point in time. 

It's not whether a $100k speaker is ten times better than a $10k speaker. If Magico priced the Q5 at $10k they would not be able to produce them to meet the demand --  but at $59k you can buy as many as you want when you want.

For openers, the use of real wood, specifically, Maple.
Then comes the finishes and layers of it.

I was not impressed w/ TAD.

Jafant I suspect you may have heard them in a non optimal set up. Also they can image narrower than other speaker setups, due to being coincident point source.   I remember when the q1 was introduced going to hear the demo on some unfamiliar spectacular audiophile tracks and thinking wow my CR’s don’t image like this. But then I asked for 2 standard tracks (a bill Evans and a Rickie Lee jones) and was surprised they didn’t sound very good. On my system and hour later those same tracks had so much inner detail they sounded like audiophile recording.

That being said, after hearing a few Raidho’s at a show 2 or 3 years ago I felt they had more upper frequency air than the TAD’s. Rather than ditch them I added ’stat supertweeters and subs. (which I do now sell as well, BTW)
I hear live acoustic music from up close often (and even a friend singing along to my system). On good recordings it can be shockingly close, even though my system may not tick every audiophile box, and may not be the system of choice for large scale orchestral works.

...but what makes the price what it is? 

Marketing