I've never sold anything and I have let bags rest to find I 'relove' them a couple years later so I know I would have seller's remorse right away. I have a birkin that I don't use often, but when I remind myself that I bought it from the store and paid about half of what a new one costs today it doesn't feel so bad to let it have a rest. Had I sold it a few years ago, I would be thinking how expensive that exact bag is today and plus I know I will love it again. Keep the kelly, it is a timeless classic and if you don't use it for awhile no harm, you will 'find' it again.
Thank you for that comment. This is what I tell myself about my lone 35 raisin box Birkin that sits in the box. All by herself. Alone. Unloved. *Sigh*