What's With All This Frozen Yogurt?

It strikes me odd that with the crappy economy, businesses of all genres closing shop and every third window showcasing a FOR LEASE sign, that Frozen Yogurt stores are popping up everywhere you turn
Any comprehendible theories on why this is? It all started with Pinkberry and now there's all these other places with real cheesy names...Red Mango, TuttiFrutti, YogurtLand, Penquins, The Big Chill, Yogen Fruz, Froyo Girl, Yogurt Haven...the list goes on and on. I like an occassional frozen yogurt as much as the next guy but I think this fad is going overboard. What makes all these people who have some cash to lay down say, "Hey, let's open a frozen yogurt shop!!" 

