Why you are worrying about revenues of cartels?
If you think that selling drugs is legal, then their business is equally legal to business of Apple or Microsoft.
Why you are not worrying about revenues of Microsoft or Apple?
No one here is claiming that selling drugs is legal. Some of us think that selling drugs should become legal, in the hopes that businesses that are like Microsoft and Apple, i.e., don't assassinate judges, etc, will outcompete the cartels and decrease the cartel's revenues, hence decreasing their ability and participation in such undesirable activities.