As Deep_333 said, the type of people that buy $50,000 speakers are not going to flog them. Their musical tastes likely run toward classical or jazz, neither of which are terribly hard on speakers unless deliberately pushed to the point of clipping. I’ve purchased used speakers since the early 2000s, and never had any issues. Ditto for speaker cables, interconnects and power cords, which I always buy used because they’re much less expensive AND already broken in. (I like MITs, which take 300+ hours to break in).
What’s my point? Instead of buying a new pair of $50,000 speakers, look for a used pair of $75,000 speakers (the ones you REALLY want) for $50,000. You may also be able to find a dealer that has some taken some back as a trade-in towards a higher model that will throw in a full factory warranty to sweeten the deal.