Well, here's a suggestion, why not keep the shops buying price the same, but
lower their sell-price significantly.
If shop prices were like 1,5 or 1,3 times the price the shop bought the item,
some people might consider buying their sac-craps or some lowbies even some
pieces of eq from shop.

And how would it help? well at least it could have a chance of taking cash out
of the game.

and yeah, i know my english is just horrible, tired etc but you should get the
point