This baffles me a lot. I constantly see people selling 50 x Chunks of Metal Rock for 150c (or even less). Which, given the listing fee of 3c and commission of 12c doesn't make a whole lot of sense to me (it nets 135c). Street vendors pay 3c per chunk...
Why not sell to street vendors directly, make an additional 15c AND have the currants right away?
Revilo