I've a wooden wheel for my 4200 I havent fitted yet, bought at a good price, never fitted, brand new.
It's a lovely thing for sure, the reason why I bought it was that I feel the standard black wheel to be a little bland, and skinny, the wooden one is a bit more chunky on the rim thickness.
I think the wooden wheel on Maserati's to be a bit traditional more than anything else.
Saying that I would love a carbon fibre one, but mega money, but I bet the list price for the wooden wheel was not cheap either!