Citing 1 example doesn't set the precedent for all of them. I've never seen that color on any McLaren, now I know why, it doesn't look good. It's definitely not a desirable spec, and still over sticker.
Asking price is just that. Remember when a certain dealer was asking $749k for them and not selling them? Without saying too much, dealers list cars at high asking prices for various reasons. Maybe they paid too much and have a set margin they price at. Maybe they got it for a personal collection but paid for by the business so they have to list it for sale so it's not considered a company asset. Maybe they're floor planning the car for liquidity and if they sell the car they'll have to pay out on it and don't have the money to do that. Maybe they're laundering money and have to justify a value on the second set of books. In all of those cases they aren't trying to sell the car.
SELLING price, across a reasonable sample group, is how market value is determined. You might be surprised to see what many cars are actually selling for vs asking right now. We're starting to get into buying season, the market may change.