> Luxury cars often have high maintenance requirements and poor reliability since cost is not a concern to their owners.

This is absolutely a nit and does not disqualify your overarching statement at all, but generally these attributes are due to the constraints of technology-- for example, fitting large, high performance engines necessarily increases the frequency of maintenance intervals as well as the difficulty (and therefore, cost) of maintenance. If luxury car manufacturers could make cars with the handling and performance characteristics of their flagship models but with the maintenance costs and intervals of a Toyota Corolla, they absolutely would.