actually i am sure those bags are not fake per say i most cases inspired and not neccesarily cheaper. there are reputable brands out there (ferragamo, comtesse etc) who have kelly or birkin inspired shapes in their permanent collection
why they do not buy H well that is something only they know but if they are happy with their choices i am happy too
Re: Socialites and fakes. I think probably not all of the socialites are necessarily into designer bags and knowing what is what. So like lilach said, they buy something they like, expensive or non-expensive, and it happens to look like Hermès, KWIM? This of course does not apply to all of them, but some.