I love Tesla, and I think they've got the right idea with the design top-down approach. But I don't know if I'd buy one even if I could afford them. They may have near-zero routine maintenance costs compared to an ICE car (gas or diesel) but how much does a replacement for that battery pack run when it comes due? And how often? I have yet to find solid numbers for maximum lifespan in miles, or replacement cost. Neither are things Tesla Motors wants to share, and I don't blame them.
For the record, I own a $3600 Mercedes (a diesel W123). Unlike Tesla's cars, there is a thriving used market for those.