The whole pay for the person behind you thing has been kind of a somewhat popular thing the last few years it seems. It's entirely possible it was truly random.
PSN ID: sled_dogs76
60" Pioneer Kuro Elite PRO151FD, Yamaha RX-V3900 A/V Receiver, Oppo DV983-H player. Coming soon: 2 Seaton Submersives from Mark Seaton