Yes, the payment is higher, but I'd have no fuel expenses (currently ~$350/month), so technically its only $450 more a month (3 hours of my time).
I'm not worried about going with the smaller pack; it only takes 90 seconds to swap it with a new, higher capacity pack down the road.
What do we consider affordable? I haven't had the time to do this, but you could take US Census data (average/median income per zip code), derive a formula for percentrage of income someone can spend on transportation, and thereby determine what affordable is.
A Model S is definitely a luxury item at this time; on the other hand, if it was self-driving, and could roll into bays to recharge all in software, with access being on-demand (Uber, with no drivers), they wouldn't be expensive. It would be the same as a company buying airplanes and selling seats on said expensive aircraft.
Maybe we're looking at Tesla wrong. They're not selling luxury cars; they're bootstrapping a mobility company by selling to the wealthy.
I would agree with this statement 100%.
Model S vs the new Corvette Stingray
https://www.youtube.com/watch?feature=player_embedded&v=VOqW...
If you need more power than that, you might as well bolt a turbine engine on your car.
"1. Build sports car
2. Use that money to build an affordable car
3. Use that money to build an even more affordable car"
That sounds significant to me. It might be worth it but there are other ways to spend that time and money.