What if

[Netherdrake]

How about a market where to sell items and a larger drawer ?

[Guzganu]

Depends, can be good or bad. Good couse you can use rare and nice items from friends, and bad couse you can sell crap items to insane amounts of gold at a low level to your high level mates and then will be unfair game ballance. Maybe a restriction to sell the items at the same price as the vendors now give you in the open market also.

[Snugglewuggle]

Bad idea. A: you have to implement a grid for levels. like Y weapon can be used if you are from lvl 1 to 10. if not. you can;t equip it. armor, boots, etc.
B: if there is no A then..here come;s X warrior lvl 100 and sells his shield for 10. why this cheap price? because is for a friend. that friend is lvl 15. so we now have a lvl15 warrior with super ubber item for a low price. not a fair game.
C: a marketplace with tons of crap items for a 300% + price of their real valor.
The list can go on

And for a larger drawer. You mean like the inventory? If that is the case, i;m happy with only 5 slots. other's opinion may differ. i don;t know.