what about minions buy items for the titan and giving them to him? its the same thing except most titans kick the minions before that can. Minions are able to indirectly give resources as well.
Because the titan side is balanced using the total amount of gold the entire team gets, either through player controlled minions or punished minions. Builders on the other hand are balanced with the thought in mind that they only have their own lumber income to play with and the only additional income you can get is by picking up items or trading merch items or turtles.