This is a spin off on Incel's "special cartel building" thread. 

I like the idea but I prefer a more specialization perk-tree for a cartel. 
Like having it specialise even further in being either.

- Production cartel (Production/job bonus)
- Healing cartel (Revival bonus) 
- Offensive cartel (Str, acc bonus)
- Defensive cartel (Agi, def bonus)
- Trading cartel (e.g. lower trade costs or mug prevention after listing on the item market) 

Upon specializing the upgrades in that division are either being buffed, or cheaper to upgrade and the others more expensive to upgrade. 
Resetting specialization would possible for points. 

This makes it also more viable to find players in a playstyle of your liking. 
I know it was Jari's and Merchant's dream to start a trading cartel. 
However, everyone ends up being "the same" cartelwise.