Deputy services are already considering selling
their customers stuff, at least i know that it has
been talked in the AC forum and Nick said that he
was studying the possibility. 

I guess it needs to be planned carefully, i mean,
for example, if i were a deputy service i wouldn't
sell anything that i don't have on my hands, so i
would at least require that the customer sends me
the item he/she wants to sell.... and probably
other things that i have not thought about.