I'm a mortgage specialist in PA. Please keep in mind I'm not a realtor. I actually graduated from Lower Dauphin which is ajacent to Hershey. Both areas have GREAT schools and from what I've seen when I used to live in the area resales are pretty good. I'm not sure why such the high turnover but both areas have grown ALOT in regards to real estate so possibly selling and upgrading or downgrading could be a reason. I can point you in the direction of a great real estate agent if you need or also if you need help with a mortgage.