Where/what is the best place to sell used components

All very helpful! Thank you. 

Where would one find a "budding audiophile"?

Lots of people are moving things on Facebook Marketplace, on a group called Audiophile Swap and Shop.it’s a private group with almost 57K members. People selling lower end to higher end. I have had good luck and know others that have as well.

Unless you sell everything face to face, I’m not sure the hassles of shipping, etc are worth it. Personally, I would donate them and write off the donation. It will be worth more overall.

Similar to what has been suggested - do you perhaps have nephews or nieces who may appreciate a special gift?   It could be life changing, so you will have to think very carefully....