Let us trade in the game. Maybe like a clan function where we have to pay some thorium for every transaction between two players, or some open market where we can put offer and also what we want back and then other people can search it like:
[Offer:
Give: 1x Raptor
Want: 15 000 Au]
[Cathegory: Robots; Resources]
[Offer:
Give: 500 Au
Want: 3 000 powercells]
[Cathegory: Resources]