My WAG: 35k car is a loss leader, with either no margin or small loss. Every penny counts, and yes... they want there to be reasons to buy the upgrades. Nonetheless, I usually charge my S on 32 and it is more than sufficient for overnight charging.I'm more curious about why the base model has a 32 amp when the big battery has 40. That's pretty limiting on an already small battery. It's as though they don't want to sell the base model.