Maybe you have to trade at around the exact Gralat value, so you still buy/grind aimlessly for stuff just to get your BAR.
Not bought? Too bad. Auction? Sold at auction price! :P

And ruining graals "current" economy.

This could make a ridiculose amount of money on the other side too.
No one is going to sell there bar (its the best gun in game)

Things that are in very scarce numbers (such as golden umbrella) would sell for 100s of thousands of dollers as they are extremley rare. Everyone will want one so they will buy graalet packs.

Release a rare gun, item, etc every week in low numbers (1-10) and those will sell for a super high price. Also more items :D

However this can be a problem when people will start making the less expensive guns sell less.

Bars would also sell for at least 100k which is 50$