Actually, it's two jabs, but the point remains valid.
Also, never having chickenpox means you won't develop shingles later in life.
I never got chickenpox as a child. My doctor at the time even had me tested, thinking I had gotten it so mildly that nobody noticed. My brother was in the same boat. We both got vaccinated as adults (I was in my early/mid 20's at the time). I thought about the whole shingles thing, but decided the risk of getting chicken pox as an adult was high enough that I wanted the protection. It was my sister-in-law's pregnancy that led to me getting vaccinated since I figured the child could be an additional vector for me (and I was frequently travelling overseas at the time, so that added to the risk). I don't regret it. They also have a shingles vaccine these days, so I'll probably make sure to get that at some point.