Fine, don't change them, just run them as they are. While you're at it don't brush your teeth and let the dentist pull them out one at a time... or, for that matter, why bother changing the engine oil.."there's still oil drippin' off the stick".
Point is, there is a major difference between maintenance and fixing. I'd rather take the easier and cheaper route and just "go an extra mile" and maintain. If that means changing the transmission fluid and rear end after so many miles, so be it. If you own a corvette you have a car that is worth taking care of very well, as there are many homes in Nebraska that are not even as expensive as a corvette. ALL cars should be maintained, not just the expensive ones or they 'will' become more of an expensive one.
Change that rear end oil out yourself and save some money. Simple job. Some paper towels, a good socket wrench, drain pan and gasket material and you're all set. Piece of cake on the rear end. Transmission is a bit more involved because of their very nature in not having a drain plug. That too can be fixed.
