Hold up. It was explained that that little chunk of money is completely offset by Tesla not having to open additional stores/galleries as aggressively. It was also, as mentioned by chickensevil, a way to incentivize/rewarding owners who specifically ASKED if Tesla would/could reward them for all the cars they (the owners) were selling via word of mouth. It's widely known that Tesla car owners are the best sales force in the world, so why not throw them a bone?
So, while on the surface it looks like a price drop - it's not really.