Just looking at the cost of iPhones on eBay and some phones are regular priced but then some are a bit lower and labeled bad ESN. What exactly is that and how useless is a phone with a bad ESN to warrant the cheaper prices?
Bad verizon iPhone 5, iPhone 5c, 5S= buying low price and than funneling it via black market overseas or non-American carrier equals big profit margin since phone is not blacklisted.