Do you think the results are valid at this stage, in terms of representing how men feel generally?
You do have a double-layered selection bias going on. First, only people who would sign up for a "large penis support group" are voting; second, only people within that group who are interested enough in foreskin or circumcision (or who are up too late, or too bored to do anything else
That said, the sexual health research I've seen shows similar results to what you're getting, so congrats. The vast majority of men with foreskin would not consider losing it, whereas cut men are more 50/50.