you get tons of taxation reliefs on it and because its a bit expensive to buy - most people who can afford it can also write it off as "expense" - a lot of them are "leased" and not "owned" - the real brunt will come across to the real owners who buy these lease returns.
Being green is not a priority for "muricans" they always lean towards "big american oldschool engines and big huge SUVs (chev suburban - aka schoolbus)"
The reason to buy these cars
1 - Free to run on roads
2 - no expenses - all maintained by Tesla (all inclusive)
3 - excellent tax reliefs at the end of the year
4 - excellent write off vehicle.
5 - some cities also give you tax breaks due to it being no emissions.
WIN WIN for the people who can afford it. Its about the same money as a starting S class.