Oh, yes, buying something expensive is no way to save money! But, Tesla has long touted that their MSRP is "net" a lot lower than the figure suggests thanks to the huge savings from not buying gas.
And yes, fuel costs for the Tesla (kWh are it's fuel) are a lot lower than ICE cars, but compared to hybrids, the savings are much smaller and really takes some of the stuffing out the argument for paying the Tesla premium.