Yes, a watch winder can be used simply as a case to store and protect your watch, even if it's not an automatic watch that requires winding. While primarily designed to keep automatic watches running, they also offer a secure and stylish way to store your timepiece, shielding it from dust, scratches, and other potential damage. 

Here's why it can be a good option:

1. Protection:Watch winders, especially those with a solid case, provide a safe environment for your watch, protecting it from external elements. 
2. Display:Many watch winder box are designed with aesthetics in mind, allowing you to showcase your watch while it's not being worn. 
3. Convenience:If you have multiple automatic watches, a winder can keep them all wound and ready to wear, eliminating the need to manually wind each one. 
4. Storage:If you're not using a watch for a while, a winder can be a convenient place to store it, especially if you want to keep it wound and ready to go. 

However, it's important to note:

1. Not necessary for manual or quartz watches:Watch winders are designed for automatic watches that rely on movement to wind the mainspring. 
2. Potential for wear and tear:Some watch enthusiasts argue that keeping a watch constantly on a winder can cause unnecessary wear and tear on the movement. 
3. Ultimately, whether you use a watch winder as a case is a matter of personal preference and depends on your specific needs and the type of watches you own.