I see nothing wrong with this. There are plenty of other dating sites, some even free, where they can meet people. If you go on a site for 'beautiful people' you have to go in with a pretty high confidence.
That being said, years ago when I was on a dating site, I had to deal with people who would mis-respresent themselves. I'm not against those that are over-weight, hell I could lose a few, but in reality it's in your best interest to be honest about it so those who aren't attracted to larger body-types won't reject you, and those who are into larger body-types will be able to find you.
I recall one guy who messaged me repeatedly and only gave me a head-shot. We then met for coffee, and when he arrived I was in shock as he was very, very, large. I'm not attracted to people who are unhealthy, be it really stick thin or really over-weight. I wanted a partner who I feel confident has some degree of health, it doesn't matter if they are gorgeous, but I couldn't see this guy accompanying me on a hike or bike-ride. I was polite and made modest conversation, and eventually he admitted to only sending out headshots from when he was 100 lbs lighter for that reason. I then told him that I really hope he finds someone, but I don't think he'd fit well into my lifestyle. He agreed and realized he had set himself up, and I still see him around town and say 'Hi." There are no hurt feelings, but it is truly frustrating when people aren't honest.
I had a few people call be a b***h over it, but I'm sorry, I'm not going to lie about being attracted to someone to be 'nice.' There is someone out there for everyone, you just have to be honest and comfortable in who you are.