Jerseyduke, living right here near the mouse I have a lot of friends, neighbors and acquaintances that work for DVC. I can promise you it costs a truckload more to operate just one of those kiosks for one day than it would to give away one very nice referral "reward" to a referring member.
And just to clarify, the referral program is for when someone a DVC Member has referred actually purchases and closes. The rewards were never just for referring. And of course that falls in line with about any other referral program out there.