[RedDevil]

The difference is that Tesla does have a fully functional production line ready, is making the cars, is planning on up-scaling and has proved with the Model S and X that they can pull it off.

The production is limited as they are still testing and checking the production process and will only upscale when they are confident it is running OK. Some of the teething problems may only reveal themselves when the cars get used in the real world, so it is unwise to produce in large numbers yet - don't want to do a series of recalls on a large number of cars...
Then, the extra's are just that - extras. But they do boost profit while the number of cars produced stays the same. And they double as testers for those extras.

In a year Tesla will produce 10,000 cars a week. Until then, they serve those who paid the most first. Makes sense to me.