WOLF Meridian Watch Winder

You're just making anologies between two entirely different things. A car and watch are entirely different mechanically. Car needs to be run every so often to stop flat spots on tyres. Water ingress through condensation in brake lines, engine. Damp developing inside etc. Condensation in fuel tank etc. None of these risks exist for watches. The reverse is true for watches, you can not wear it for 2 years, and then pick it up and wear it without any issues. In fact having a watch in a winder you're not intending to wear in the next few days is putting unnecessary wear on the movement.

No citation necessary. If you don't need to keep the watch running perpetually and don't mind re-setting it when you take it out to wear it, you should not see much in the way of trouble. But every high-end watch manufacturer will advise you to keep them running on a winder...it may be they want to keep the watch running so they can ding you for service and fees, but every watch I've had runs better when I leave it running even when it's not being worn regularly. YMMV.

Some people have more than one automatic watch and switch which one they wear, so for those people who have two or more they can keep one wound while they wear (and keep the other wound). Other watches -- some older, etc. -- don't keep winding fully during the normal day/night when worn, so a winder can augment the winding process for those watches that need help. Finally, there are people who can't spend $2500 on a five-head winder and will only spend enough to keep one watch wound while they wear a second watch. And bonus: some people have non-auto watches in their collections so they may wear a non-auto watch one day and the automatic they leave on the winder another day. It's a matter of switching off. I've got several automatics but I'd rather spend $2500 or whatever on another watch rather than another winder. It's not ideal, but then again, neither is having to spend $2500 or more to keep your watches running ;-)