What is considered a "standard" percentage of devaluation per year foor high end speakers?


As the title of the thread indicates, what is a standard devaluation per year of high end speakers in generally  good condition. 

Often, on Audiogon, sellers ask for 50-to 65% of the retail price for speakers that are between 7-10 years old (or even discontinued) regardless, whether they paid retail or not. 

I realize that condition and the number of owners is a determining factor, and it should be. 

Thank you,  S.J.


sunnyjim
Four years ago I purchased a like new pair of Revel M106 for $1250.   Listed them on Craig’s for $1100,  sold for $1000.  Buyer was happy,  I was happy to get $1k, effectively “renting” them for $250.  

I bought my my amps for half of new at only 13 months old.  Unlikely I’ll sell those anytime soon but they will be worth close to what I paid for a few years if I ever did. 

I like buying used if it functions like it should but it has to be super clean or I’ll pass.  Like anything condition and demand dictate resale value.  
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