I would think it's hard to get much business as a candy shop. It's probably not somewhere I would go regularly. My kids would want to go, but they have a very limited income
I would suggest, instead, opening another frozen yogurt store. NW Cary is in need of one--at Cary Park Center. We're currently about 25 minutes from any frozen yogurt place. I would think families would go there after dinner, especially in the summer, moms might stop with their kids during the day, and kids would venture in from the nearby Mills Park and Panther Creek schools.
If you do a serve yourself, priced by the pound store (like The Skinny Dip), you could also have fun buying candies for the toppings!!