@amigakit
Why not support morphos on your store?. In many european countries 2nd hand ppc macs are still expensive and hard to find, refurbised ppc macs with expansion cards, hd... at good prices can be a good idea.
High risk of buying non-working/malfunctioning hardware when sourcing second hand;
High manpower-per-unit required to clean/service/test them prior to resale;
Lots of risk providing any kind of warranty with used hardware;
Paying postage twice (once at purchase, once at resale);
combined with:
People can pick them up for next to nothing on Ebay.
I've thought of doing it myself, but there's just no (or not enough) profit to be made.