Car appreciation... the aesthetics, the engineering, etc

Call me slow, but I really am not following this bit of MM, beyond the first sentence.

I get similar car allowance, I just pocket it (after gilding HMRC) and run whatever, currently the M3.

I could just trouser the cash, yes - I am thinking about using it as a figure to aim for/to keep under per year.

In reality I get taxed on it, so it's not 6k dans le poche, but whatevs.