Ooh, that's a good idea. We can sell ad space on the back of golems and spire ships, and occasionally have waves result in a "popup attack" instead of actual enemies. Players will
love this! Also, we'll have to start requiring all players to give us their email addresses, so that we can find some shady marketing firm to partner with and thus use their personal information to give them targeted ads. Everybody loves custom stuff, so why not ads!
For the love of god, if anyone ever reads this and thinks I was serious...