It's the most efficient form of getting a reward. If it wasn't for the reward very few of those guilds would tower. Efficiency has no place in towering if you're up against a guild that has more players with nothing better to do with their time. Which leads me back to the original post I quoted. Saying that a retired tower guild is the same as a dead 1k hat guild makes no sense.

Players that were in Nal, VG, CoM, and other similar guilds have pride in their guild. They did it to tower while guilds that are soley for the purpose of chasing a hat have 0 players that have any pride in that guild. You really think anyone is going to look back and brag about towers inc? That's probably like the 5th hat guild for a lot of them.