"You can also start taking advantage of our referral program and help your friends and family members make the switch to cleaner, less expensive energy with SolarCity. Each referral that signs up with us will earn you $400. "
The other interesting thing about the SCTY referral program, is that the referred buyer ALSO gets a reward/discount (rewards seem to vary month to month, from a Home Depot pre-paid card to $ off the bottom line). So it's better to be referred to SCTY then to just call them directly. Not sure if that changes the calculus at all, just pointing it out.