Yeah there are more guys than gals who own snakes, but that's because your average snake owner is some kid who talked his parents into buying him a pet, and I'm sure that category of snake owner is pretty dominated by the guys.

If you look at people who own multiple herps, or are into herps for many, many years, the representation by gender is probably fairly split down the middle. However I think that the people who are more serious about snakes and other herps are much fewer in number than single-snake owners(especially impulse-buyers).