Interesting. I'd be more concerned about breaking the first generation than the 3G.
To each their own I guess.
I bought this first-generation iPhone used a short time ago - it came to me already very beaten up with many scratches and dents, which was the point. If it were pristine, as the first-generation 8GB iPhone I sold to buy the 3G was, I'd be too afraid to use it for snowboarding. I have no such worries given its current condition.