You just listed multiple unknowns (I'm going to ignore the car maintenence analogy, as that is false equivalence, no one is talking about maintenance, we were talking about warranty service for damages).
You said you don't have maintenance related data for the HD800, no repairs costs, no time of repairs, no comparisons to third parties, and no idea if third parties exist. Which is precisely my entire point, and is why you would want to at...