I read an article about what is involved in doing oil changes on the latest incarnation of high performance cars with dry sump systems. Not only is the system drained through a main drain plug but there are numerous other plugs located about the system, including on the engine. Each plug is removed to allow oil to drain from that area of the system and then a new washer/gasket is installed. This requires disassembling other parts of the car to get at the drain plugs. That results in a complete oil change!
I looked at the Vanguard process and it's a whole different ball game. The system holds 6 quarts but the oil change requires 5 quarts. There is no attempt to remove all of the oil from all parts of the system (engine, hoses, fittings...). But then the price tag of the mowing machines aren't in the same multiple 7 figure price region as say the Bugatti.
I don't know if Bugatti offers different brakes for road vs. track but I thought they had carbon composite rotors on the new ones. I couldn't recall the cost of the carbon composite brake rotors like those used on F-1 cars so I just looked. It seems that three years ago they ran to the $6,900 for each one and they last 250 miles! I recall seeing a clip where one of those carbon composite rotors failed on an F-1 car during a race.
While I could "justify" buying an MS661 I don't think I could ever "justify" owning any vehicle requiring that kind of maintenance! LOL