Why do people not finish Face of the Mountain first before going Sunfire/Locket/etc.?
That shield and extra income are important, you know. If things go south, you need those extra Spoils of War charges to catch back up, or your support tank is going to be left in perpetual poverty, especially since the FOTM line doesn't give a GP/10 bonus.
Additionally, since FOTM lets you execute minions more easily, it helps with counterpushes in a pinch.