As I have discussed how to fix the iPhone 5S Blue Screen Boot Loop here, I went out to look for some iPhone 5S that have this exact problem. Read the tutorial to see how to fix these and make a quick buck!
Current eBay market place shows that the iPhone 5S is being sold used for on average:
iPhone 5S 8gb: $154.93 avg 63.16 % sold
iPhone 5S 16gb: $ 224.44 avg 67.00 % sold
iPhone 5S 32gb: $296.55 avg 65.00 % sold
iPhone 5S 64gb: $ 276.98 avg 66.00 % sold