Make a button to view someones inventory.
If you are in a trade and want to view it the other player witch you trading are need to give you access to your inventory.

Or the player say what stuff are tradeble so when the other player who want to view click the utton to look he only see the stuff he/she want to sell.
So no more players at start who want to sell stuff.


Next thing,
Auctionble items
So a player say i want to auction this for other stuff and the auctioner can see how much the stuff worth what the players want to offer.
The auctioner set a timer like 10:00 min so after that no 1 can offer more.


Last thing,
Something that you can buy for your house so the trading booth are only available at houses who buyed the trading booth, same as the auction booth.
The price for the auction booth is: 3,500
And the trading booth will cost you 6,750

So not everyone can trade only people who got the booth.
When you enter someone who got the booth in their gang house you can only trade people who is in the house/gang house.

So trading with gang members is easier,
Normal players are allowed to invite other players to other gang houses.
Only if the player is allowed from the owner of the gang with the option can invite other players to my gang house.

P.s. will the fee go 10% to an gangbase? So it can be booths at houses and booths at a shop when a shoo maybe in bbz bbz get 10% from the 400 gralets from the fee