Rag Top, I'll throw my 2 cents in here: I think it depends on how your car is stored.
A heated and cooled storage space (think forced draft, or heat pump for keeping it warm and A/C for cooling) with a fairly constrained and consisitent temperature will do a lot to reduce condensation and prolong the life of your engine oil. If it is stored were temperature and air flow are not controlled you will develope corrosion on wire connectors, rust on steel parts and condensation within the engine. The longer the car sits in one place, and importantly the longer between driving intervals the more important the storage space becomes. Even with near perfect storage your tires will break down and must be changed about ever 5 ~ 6 years regardless.