You can never trust the previews, and a model who is known for scamming for years, and trust me ain't no way that Jade doesn't know that the agency is scamming.
She was doing a similar thing last year on her birthday; she had like 10 levels to unlock, and each one was more expensive and "showing more" but someone said that he got up to 500 dollars and never got anything good. The agency was claiming that the last couple of levels are full nude and between 500-2K. Some said that she doesn't show tits even for 2K, so not sure who you can trust.
So it's a big gamba with your money, but if someone is advertising that she is showing tits in a $ 50- $ 100 PPV, and at 500 and you still haven't got any nude stuff, not sure if there's any point to even try.