But I would never sell something expensive to a friend, period. There be dragons.
If I want a thing gone, for whatever reason I want that to happen, then I want it gone. I never want to see it again.
When I get rid of a thing with eBay or Craigslist or FB Marketplace or whatever this decade's thing is, or with a dumpster, then it is gone from my life. It will never resurface.
But friends have a habit of bringing things back. Whether it's "Hey, remember that camera you gave me?" or "Hey, my old lady is kicking me out -- can I store some shit in your garage [like these four giant rackmount Elo touchscreens that I wouldn't let you bin two years ago]?", things given to friends have a bad habit of coming back 'round.
On the other hand, I wouldn't ask my friend to pay more if selling, so maybe a par price is fair.
Price and value are not the same. The logic of your friend was basically putting a price on how "special" (or not) he saw your relationship versus some rando-buyer online.
That is why people (close to you) get riled up emotionally: they're being treated in a way no different than a complete stranger.
(I do think a slight discount often makes sense just because a friend is probably quicker and easier to deal with. But anything more substantial turns into asking for free stuff, and yes and no are both perfectly fine answers to that.)
Yes dealing with friends is nicer than strangers - but also when you're selling stuff, sometimes it's better to do strangers. Expectations of long term service and support are clearer and have more defined boundaries.
Declining to give you $600 out of the blue because you'd rather have more money is not being indifferent.
Sort of. People are being less irrational than it sounds if you account for transaction costs. There's a lot of stuff I might "sell" if I could point a video-game-like pointer at it and right click and hit "sell", and it just instantly disappeared and money was credited to my bank account. Perhaps even more if buying was just as easy and I didn't need to hang on to something like my drill which I don't use very often and I could trivially "rent" it from the market by buying, using it, and selling in mere minutes.
But in practice one-off selling for anything less than $100 or so is a waste of time because there are significant transaction costs for one-off events like that.
>Buy for $x, have and not sell for $x, same mathematically.
They're not the same.
£20 item to buy, I have £100; buying leaves me £80. Either, I have £100; not buying/selling leaves me £100 £20 item I own, I have £100; selling leaves me £120.
In the first case maybe I can't make rent now. In the last case I have more cash, but then I need to spend money if I want entertainment/utility that the item had. In the first case I lose 25% of my cash; in the last I gain 20% (this matters when you're sharing your money across different needs).