actually, I've found that those HUs without power, retain their value better, probably because the SQ freaks know what they are looking at and KNOW what they want.
generally, a true high quality QA HU doesn't have all teh extra junk in there to dirty things up.
not to mention, SQ systems in comps, don't have rear fill.
you don't buy a high end hu looking to make your money back, or worrying about resale, you buy it because it's what you want and it's what fits your needs, and you won't settle for anything less.
That was the 8061 for me back in the day....just barely out of reach....but I did run the 8051 for a LONG time (actually, up until the computer) and LOVED it.