I definantly don't...there are plenty of others that do that I know of though.
When I worked at a local pet store, I had a woman bring in the head of a harmless gopher snake, telling me she thought it was a rattler. I think a lot of the people who do kill snakes on their property do so either because they are uneducated about the animals, and view all of them as a threat, or they do it for fun.
As a kid growing up I saw a lot of snakes killed out of sport. I doubt I'd even kill a rattler if it bit me...