Somehow my swap buildings price was -2 gold... A little bit of grinding by swapping some buildings back and forth later, and I'm getting 1.2 Trillion gold per swap.
Haha oops. Ritual cost reductions (from scientists/runesmiths) need to be capped. Plus I don't like the current ritual system of costs exponentially increasing per use either, so I will make a better more linear and cheaper scaling, but increase cooldowns.