Long time indeed, hope you're keeping well. Yes, still got mine but not ridden it for about 10 years now, it's in the living room with the 916 and 748 SPS plus a couple of others. Never sold any of them just bought a few more over the years.
Given its rarity and all those upgrades, I reckon the value will definitely hold or even increase over the next 10-20 years, especially since you’re not in a rush to sell. However, keeping it stored and insured can add up, so it’s a bit of a trade-off. If you love looking at it and have the space, maybe hang onto it and enjoy the appreciation. If the costs start feeling too much, you can always reassess.