What's the deal with all of these 'new' frozen yogurt places?

In the past 9 months it seems like there’s a Pinkberry, Starberry, _______berry, Red Mango or some very similar business model frozen yogurt place popping up everywhere – sometimes more than one on the same street. I don’t get it. I know frozen yogurt was a huge craze in the late 80’s, early 90’s – but not sure what this whole new trend is about. I thought we were kind of over it and had moved on. It’s like these places just discovered it / or are trying to do something retro? Has anyone else noticed this?