@cd318 Quite a difference between Harbeth's and JBL L100's!! Presumably your sister was primarily into rock, which might explain the preference for JBL's.
@jl35 You ask a good question, how much do consumers in the very high price range for some of this audio gear concern themselves about re-sale value? I suspect little, because most of this gear drops heavily in value once used. There are numerous examples of high $$ speakers that are not easy to sell at 70% of new- once hitting the used market, regardless of age!
OTOH, while this is an interesting point, i am not sure at what price point this relates to my OP, because there are also examples of far less expensive gear that also fails to hold value, and naturally, there are a few examples of gear that has actually risen in value ( although a much much smaller category).Albeit, I can't think of a ultra pricey speaker system that has risen in value.