Hi. I just got a 1992 K75S in December.
I'm returning to riding after being all grown-up for a while- yuck. The K series has interested me since they came out, so chances were good that's what I'd get. It's like I found my "Motorcycle Want List" from when I was last serious about riding, went out, and checked one off the old crumbled list.
Mine only has a little over 12,000 miles/20,000km on it, but I've been replacing all the aged or cracked rubber and plastic parts, changing fluids and filters, etc. The mechanics of the Ks have intrigued me for years, and now that I have become more familiar with it in that respect, I find it even more interesting. I'll be doing some small job on it and catch myself just sitting and studying it and mumbling things like "Look how they did that.".
Yes, it's been worth buying just to look at.