My logic was very similar to rcc's, above. I drove the Tesla and was smitten, but the cost seemed like an insurmountable hurdle--it was roughly 35K more than I'd ever spent on a car, and even that particular car (an E90 M3) I ended up getting rid of because I didn't drive it enough to justify the cost.
But I kept thinking about it.
Our current family car is a 535 wagon, which has plenty of space for our daily needs but cannot accommodate 3 kid seats. When we need to carpool with another kid for whatever reason, we are SOL. So, I started making a list of all of the cars that would give us that ability.
What I came up with was: 1) a faceless army of soul-destroying 3 row vehicles based on domestic or Japanese FWD sedans, like the Honda Odyssey/Pilot/MDX, the Ford Flex/Explorer, and Toyota Sienna/RAV4, or 2) Brobdingnagian European 3-rowers whose girth was matched only by their thirst and price, like the X5, Q7, LR4, etc, or 3) full-size domestic sedans like the Taurus SHO or Dodge Charger that might fit three seats across the back.
None of these vehicles, with the potential exception of the SHO and maybe the SRT-8, had even the slightest sporting pretensions. All of them cost a minimum of 40K (optioned as I'd want), on up to 70+ for some of the European SUVs. None of them inspired even the slightest interest in me.
So, armed with the conclusion that there really isn't anything else out there that both does what I need to do AND would put anything other than a grimace on my face every time I saw it in the street, I revisited the Tesla.
I don't drive as much as some on the board, but even compared to our current car my gas savings are going to be 150+ per month. Compare it to the M3 I used to have, and the gas savings jump past 200 (that car drank fuel like it had been designed by Saudi royalty). If you do the math on cost of ownership with the RVG, the high retail price is offset somewhat by the tax credit--the car "leases" for a lot less than you might think given the kind of crappy residual and the high retail cost. At the end of the day, the total per monthly cost for the 95K S should be about the same as what I spent every month on my 60K M3.
That was the moment it really "clicked" for me--I think I submitted my down payment the next day.