You're equating gay people with addicts? :|
Yeah, kids get their values from their parents, but they also get their values from friends, teachers, other relatives, television, etc. but that's not really what I want to argue about. Does it occur to you that kids of gay parents may simply be less afraid to come out of the closet than kids with straight parents and that this alone may be why it might seem like gay parents are more likely to have gay kids?
By the way, just an anecdote, but I know a girl with gay mothers and she's straight.