Sell or keep

Hello dear forum experts, since I am currently using my beloved Sl 350 from 5/2005 very rarely do I think about selling if it is halfway worthwhile, or to leave it in the garage and hope for more driving opportunity. What do you think would be a realistic price to achieve? I think this is something for lovers and possibly collectors and to those I would even sell it. It is an edition50 (quite noble as I find) in the color Silverarrow with black nappa and largely full equipment. Pure seasonal vehicle with 23000 km mileage and in new condition without any quirks and scratches, inside as well as outside. Thank you for your opinions lg conchecco