I personally WOULD be interested if I still had a copy. Unfortunately I don't have one and Blizzard's online store doesn't have Diablo 1 available for buying alone, only as part of the battle set. I have plenty of Diablo2.
I'm personally going to search the internet for a demo version so I can see if I still like it as much as I remember liking D1.
I believe it is still available alone here in Germany as low-budged.