I read on the 6/27 invite thread that several people in California placing orders were only being offered home delivery despite being near a delivery center. Perhaps Tesla is seeing delivery centers as the next bottleneck in production. Doing more home deliveries would speed up the process. Also, if the tax credit drops Dec 31, 2018 since Tesla's purchase agreement states the car is considered delivered to the customer when it is tendered to the carrier making the delivery, Tesla could load every car produced up to Dec 31 for home delivery allowing the maximal credit for nearly every car they have ready to ship.