United's Door to Door Baggage

United offers a door-to-door baggage delivery service in conjunction with Fedex. The cost, $79, is still a lot higher than any airline's baggage fee (well, for a first or second bag anyway). I've always wondered who is the target customer for this? Certainly, people who are worried about losing bags would use it. Or maybe people who have difficulty carrying their bags. I'd love to see some statistics about how many people actually use this...