I was surprised at how cheap it was, actually, once I went ahead and bought myself an old C64. These things aren't remotely at "collector level" prices yet, and they might well never be. They're still usually cheaper than the sticker price back when they were new, and with inflation that's not very expensive.

I have the impression people are selling more to "make sure it ends up with someone who can appreciate it" than to make a profit, and that's a good example to follow in other niches than vintage computers I think.

Not sure about ebay but you can't sell on amazon any longer without them knowing everything about you. I used to sell but am no longer allowed. Not worth it.