I've been lurking the subforum for a while, but I never quite got that part of the spending lore. I know about WWE Champions and the alcohol, obviously, but I remember seeing mentions of some surreal purchases, like 300$ rubbish bins or 80$ hairbrushes. I don't remember the exact prices, but it was something beyond parody.
Why does he do that? Does he have no clue what the value of a dollar is? I was always curious about that. My guess is that it is a combination of his pathological laziness, feeling no sense of responsibility for the denthead money, and never needing to live within certain means. "Consumerism" does not quite explain to me, because that is something that makes most sense as an explanation for "exciting" products like Funko Pops or unnecessarily expensive cars. Instead, in his gin-brain, he feels the seeming compulsion to spend ten times more on completely mundane products like hairbrushes, compared to a much less expensive equivalent product, that accomplishes the same exact goal.
I know he had an expensive BMW, but he didn't seem that enthusiastic about it. Most people buy BMWs (which aren't the 4 Series) or similarly expensive cars because they are enthusiastic about cars and want something with a kick or sport looks. In his case, it was just a matter of him being low IQ and not understanding how maths of financing work, so he thought he was getting a good deal for it. Regardless, point being: that still does not explain why he bought these insanely expensive mundane products.