She would surely struggle to get $300 an hour, depending on where she is at on the east coast. Way too much selection in parts of that region and while her asking price is not unattainable, it is if your a girl with fake claims (Hustler maybe, no way Playboy) average, perhaps slightly above average looks, and I would assume no reviews to attest to her providing a quality session.
That is Briana Banks money and that she ain't.
She could do ok in my region (Cincy Dayton OH) where standards are lower and selection is bad, I still wouldn't see her, she just does not appear to be a perfect 10 by any stretch, but she could probably get $250 to $300 an hour here with good reviews - she has no chance in any eastern metro region where the selection is better, especially at that rate.
Makes me wonder if the ad is some kinda weird gag, not a scam just some kinda weird ploy of some kind - very few ads I have ever read have discouraged someone from taking the plunge, "she explicitly states not to contact her unless you have 2k", makes me chuckle to wonder what would transpire if one tried to meet her...