[IOwnChicken]

this wouldnt be very fair
if you bought an item for 150 from sum guy
that is worth 50 at the store
the computer would give you back only 50, causing you to lose 100g
if you told the computer how much you paid for it ppl would lie most obviously, i know i would =D
marketplace would be the best place to sell them
its not garantueed they will sell tho
and becuase of the marketplace, like sumone said, not as many ppl are massing things they are selling or want to buy. making it harder to sell your old item.

sumone could make an antique shop and things you sell get more costly and more costly as less ppl have them.
i cant script for beans so i dunno if that is possible =D