I remember when I upgraded from the C64 to the Amiga, I'd called a local trader in who was offering cash for them. He showed up, liked it, no qualms, said he wanted it, then, when we got to the door - he went back on his £50 offer and changed it to £10 cos "the sid chip sounds a bit shit really" .. I was HAPPY to boot him out, GERRORF MOI LARRRND .... I was REALLY insulted by that for some reason. I think I was closer to my 64 than was healthy back then.
It did eventually go to a good home though.
When I got rid of the A500, I found out it was more valuable in bits than as a whole unit (sad)... they were going for around £45 2nd user back then, I took mine appart and sold it as spares, got about £70 all in and I still had the case and mobo to lob in the skip .. I still cried a little, and died a little inside when I did it too

- was a very bad day for me...