I've been eyeing used bench multimeters recently and recently came across a discussion of Agilent vs Tektronix scopes. A comment on EEVBlog posits that the TDS still has value because the cost to upgrade to probes compatible with newer Tek scopes. I've no idea if that's even remotely true but it sounds plausible.

Likewise if a military (especially the US) standardized on an older Tektronix scope that might be enough to keep production alive (much like the Boeing 767 or Fluke 77). A high retail price would suggest that Tektronix simply doesn't care about retail sales.

https://www.eevblog.com/forum/beginners/buying-scope-agilent...