I couldn't find this post in the forums, nor could I find a spot for this question so here goes. Simply put can GIM buy items from other gim. This would be the same exact as normies buy items for custom donations, they would have to pay for any gim removal tickets that are needed, and should ALWAYS use staff as a middleman as you would with any custom donation. I see no reason why this would be an issue for the server, if anything it nets more money to the server with the possiblity of needing to buy up to 3 gim removal tickets.
The only downside I see really is the stigma of GIM's having their own separate economy on the server. As a counter point GIM can already freely move from group to group and transfer wealth as they please. Unless you made it where you had to have no items worn/banked to transfer groups (Terminatior style), there is no real way to stop this from already happening.