ptss, if I were spending that kind of money on speakers I would be the one making the decision which wire was used internally, not the manufacturer. If the company didn't agree, I would move on. There are far too many fantastic speakers to let a manufacturer's restrictions stop the show.
For someone with the means to do as they wished and with some understanding of how to assess cables it would make sense to conduct comparisons of the Von Schweikert proffered cable to determine whether it was as wonderful as advertised. For a cool quarter million dollar project I would expect the manufacturer to accommodate my desire to have a rigged crossover allowing swapping the cables for a listening session. I would bring three appropriate sets of cables and conduct my own session of music.
The much vaunted Von Schweikert wiring might win, but perhaps not. I have Verastarr cabling (reviewed) inside the Vapor Audio Joule White 3 (reviewed), a custom build and it sounds mighty fine. So, that might be a pretty good option. Ones that might be interesting to try would be Purist Audio Design or Silent Source (reviewed).
What experience do you have with aftermarket cables and what wire would you put into a $225K speaker?