Interesting article. If those valuations are accurate, my '95 CS convertible was a better investment than I initially thought. I basically bought the thing because it was immediately affordable but I had no illusions of it ever being a particularly valuable collector car, despite their apparent rarity. In the time I've owned mine, I have only seen two others on the road and only one CS coupe, despite the city where I live having been home to one of the region's strongest Oldsmobile dealers. To my mind, one of the major arguments against it achieving cult collector status is their build quality, which is mediocre at best. They're just not aging gracefully.
Between acquisition cost and repairs, I've got about $7k sunk into my 'vert and there are still several significant repairs remaining to be done: ABS system, A/C, new top. By the time I do all that, assuming I do them all, I'll be well into five figures and I doubt I'll be staying ahead of its resale value, not that I had any intention of making money on the car. The bottom line comes down to a question of how much the fun factor is worth. For now at least, the fun is winning out for me.