Nothing wrong will selling second hand Amiga hardware for stupid prices if there is people willing to pay the money.
I used to sell a lot of stuff on Amibench because i know the magical name "Amiga" will get people paying crazy prices for hardware and i loved it.
I payed £20 for a 64 ss edo simm then sold it on amibench for £70 and some mug bought it, i miss those days :-D