ATC SCM50ASLT active speakers retail for $22k. Discount or used bring these down pretty close to $15k. The passive version, what the OP probably is looking for, retails for $16k, well under $15k with discount or used. With that said, current revision ATC 50/100/150 speakers, active or passive, rarely come up used; folks that buy them keep them. I would be one example.
I've directly compared the 50 vs the Legacy Focus in my home. I much prefer the ATC in all respects. Of course, IMHO as a classic rock musician and recording engineer.
Speaking of recording, both ATC and Legacy sell pro versions to the pro audio market. I'm guessing the ratio of ATC vs Legacy in most of the world's best recording studios would be around 50 to 1.
Here's an example of ATCs clients:
ATC Client List
No one with direct ATC experience, either active or passive, would call them polite.
To quote Brad Lunde, US ATC importer: "The company founder/chief engineer (driver inventor) Billy Woodman had a specific target in mind back in the 70s and 80s: the wide dynamics of American speakers (JBLs, Altecs, etc) and the high resolution of British speakers (Quad, 70’s era KEF). The fault of many of these earlier American speakers is they played loud but sounded awful. Inversely many of the British speakers had great sound quality but would not play loud enough for rock and roll."
Yes, a great way to describe the dynamics of ATC speakers would be "speakers that can hurt you before you can hurt them".