Neglecting maintenance is not a good idea. The Model S even without and engine will have a cooling system for the battery. It will have coolant and should be checked for leaks and possibly other thing I do not know of. It will have brakes that have exactly the same maintenance issues as other cars, pad wear, fluid level and rotor wear. Every car should go in the air now and then and have the suspension bits looked at for leaky shocks, bent parts, dented or in the case of "mag" wheels like the Tesla cracked rims. Those very low profile rims on the prototype look quite vulnerable to even small pot holes. You do NOT want to be driving a car when it has a rim failure! There may well be other electrical bits and pieces that should be looked at to be sure they are still tight and working correctly. Tires themselves need inspection for wear and embedded bits that could cause failure or leakage. Whether Tesla makes it a gougey profit center is a question of price not the need for maintenance.