Farmers

I believe it's all in how you play. High level friends don't need the cash or xp, they're visiting to see what you're doing with your town. I still need cash, I'm in my town so often a friend might not find a suitable tap. However, I leave the lower level taps so they can earn xp and cash for their town. I guess everyone wants friends at their level, on their playing field, but I just like playing.