To be fair I'm the same, I'm like a biker checking the forecast for the next day to see which vehicle il use tomorrow. If its forecast rain, the little beater stands in. Not that the 350z is an overly special car (it is to me) but knowing that it's road spray dirty, will mean setting aside a couple hours to put right some time soon. Where as had I not driven it, it would still be clean and I'd save myself a couple hours by forward planning.
Its the OCD car life tale sadly and I know Lewis and a few others are the same.