This experiment just goes to show that the used McLaren market is confusing and needs to be properly analyzed before making a purchase decision
Hardly an experiment, exactly what was the hypothesis, prices vary? All what is being done is extracting prices with no analysis, horrible article. (I dont know if there is more beyond the paragraph quoted, it wouldn't open on my browser)
When I was doing the analysis on my 650s there were a lot of drivers to the price
1) Options - A well optioned McLaren 650s was around 50k- above the pure base model
2) Warranty - Out of warranty cars were being sold at a huge discount by non McLaren dealers
3) Spiders - Obviously a higher demand car
4) KMs - I didnt see many 650s with high kms. That being said there is no proof that a high kms car is a bad car.
As a McLaren owner, I would hate to see the price of the 650s drop, but that is something the McLaren brand should value and consider.