Buy a $40,000 10 year old amp for $4,000 or new amp for same money?


Hi. There are bargains to be had on really high-end components that are more than a few years old. DACs change too much and we need the newer technology. How about amps and pre-amps? I know it can depend on the specific amp but in general is a 10 year old amp that was $40,000 in 2009 and now sell for $4,000 a better value than a new amp that sells for $4,000 in 2019?  How much has amplification evolved in the past decade or so? (I posted a similar questions about speakers in that forum). Thanks for all the input and wisdom. 
mcmanus
10 years old amp is not that old yet. Some (like Bryston) would still have another 10 years of manufacturer’s warranty left. Though they would unlikely be sold for 10% of original price.
If your premise is true, it's a no-brainer. Buy the used amp. Who knows, if you don't like it, maybe you can sell it for $20k. I've had great luck with used amps. My Adcom 555 is much older than 10 years, and still performs very well. Same for my PrimaLuna. Amp technology hasn't changed all that much over the years. 
I think that 40k amp he saw fell off a back of a truck and is seriously damaged and now selling for 4 k. 😂
Thanks so much for the insights here. I apologize that the $40k to $4k was probably too much of a spread. I was speaking in general terms. Maybe $40k to $10k would have been more clear. Most everyone got the gist though. I asked in three forums because the answer was different for amps, speakers and dacs. Lots of great knowledge in these responses. These forum are great resources for us all.