So I was playing a game earlier were Arabia had been one of my old trade partners, but then out of nowhere decided to be hostile to me. I invaded, captured several cities and installed puppets in them, then sued for peace when my happiness got so low I couldn't capture any more cities without having a significantly adverse impact. We do some minor trading, but nothing really beneficial, then 40 turns later they decide to go hostile again. I still don't have much extra happiness for capturing cities, but I figure it might be best just to eliminate them once and for all, so I declare war and invade again... After capturing and two cities and setting them to be razed, I suddenly notice I have a lot more unhappiness and am paying a lot more in maintenance. After snooping around for a while I figured out why; Even though I opted to raze those two cities, they hadn't been completely destroyed yet, and counted as part of my empire; I was paying for them in upkeep and happiness. What is worse is that because I opted to raze them, they were inactive so I wasn't getting science, production or culture from them. In what world does pillaging and burning cost you money? Civilization V, I guess. This has to be a bug, no way this could be a conscious design decision - I get waiting several turns to raze cities to give your enemy time to recapture them, but you shouldn't pay maintenance and happiness for them!