Rambo - the biggest problem with this.. You cannot force someone to write a review. It was mentioned just last month. There was an upset hobbyist over something similar and a provider chimed in something like, "is this karma? Since I offered you a review special and you never wrote the review?"
The other problem is if someone says, "write a good review for a free session" and they do it, their credibility is down the toilet. Maybe if it said, "an honest review."
That being said... No one is up in arms over a discounted review special for someone starting out..
Either way, we all know this crap goes on.
I know of a super established hobbyist who told me about a girl who wasn't so happy with her services. He said to me, "I think when she realized my credibility and my (whatever number) of reviews she wanted a do-over." He took her up on it. And in his review wrote her rate then total time together like "3 hours + over 3 days."
I always say, when you go to sleep at night the bed can be a very lonely place if you're a dickhead. I don't feel pity for the people who have no friends. If your mentality is that of a user and you find yourself in a bad spot, well.. That's on you.
(I don't mean this as a personal attack towards you - I mean it to the shady people in the world.)
Lastly, when you were new.. What if a lady said, "I'm taking a risk on you, so double my rate." ?