A little context I’m Scottish, audio prices in my eyes are way over priced so right there I walk away from most new gear. Knowing Audiophiles are audio restless consequently there will be many pampered units in the used market.
Now I have a rules I buy within one hour driving range ( Philly NYC), never pay more then 50% of the new price, this percentage goes down as the gear ages. I just wait until my price points are reached. I have purchased my current system this way and saved a couple thousand. I purchased an integrated amp, main speakers, subs and speaker cables all used from different sellers. I did buy my cd player new. In all cases the seller came down in price. I also got lucky on timing and age of gear. Luck does have its place buying used. Oh I look but never bought on Agon.