Roleplay is only limited as far by two things;
1. Your imagination
2. The rules
With these in mind, the possibilities are , quite simply, limitless. I've come up with a huge number of both legal and illegal ways for groups to make money, including examples like;
LEGAL
-Insurance Companies (Insuring contents, buildings, cars, businesses for a premium)
-Security Contractors / Private Military Contractors ("GANGS" are already doing this ad-hoc by responding to banks - might as well officialise it)
ILLEGAL
-Illegal street racing competitions (Think Need4Speed meets Altis Life)
-Weapons Trafficking (Buy rebel weapons, sell them in major cities at a profit)
-Racketeering (I.E 'Protection Service' for businesses / groups, against the very group providing the service)
Thoughts everyone?