In his 1899 work "The Theory of the Leisure Class: An Economic Study of Institutions" Thorsten Veblen suggested that conspicuous consumption was a primary driver behind consumerist societies.
Conspicuous consumption is defined as the waste of money by certain groups of people in order for them to display a higher perceived status than others, even though cheaper products can work just as well or, indeed, better.
For example, we know that cars are for moving people and model boats around from A to B.
But notice that the thread in question started off with Lexus and a BMW convertible. Two "high status" cars owned by an individual, when only one - and a cheaper one at that - would do the job required. Indeed, a rusty old transit van from the 70s might be an even more appropriate vehicle.
That the thread has been obviously popular, and is now stickied, would suggest to me that here - in the near-all-male-scrum of Mayhem - there are some individuals who need to display their status, for whatever reasons, in off-topic idle chit-chat.
Andy, driving an all-but-knackered green Ford Ka covered in vinyl flowers, and sometimes found on a bicycle.