They way they did it does seem a bit odd. However it isn't uncommon for businesses to incentivize people who like the product to give reviews or feedback. Even if it is just you get entered for a monthly drawing if you fill out the feedback form.
People who are very upset usually don't need any incentive other than the chance to vent and rant to tell you or anyone else about how terrible you are. People who love your service usually don't go out of their way to fill out the surveys or rate you.
That being said, most of the incentives are if you fill out the form at all. They don't say only if you give us a great review, and the please call us if you aren't satisfied could be done in a much better way that doesn't set off people's spidey senses.
This product has been sketchy since it first showed up on this forum. Bottom line is that if it is good, the forum members would have made them rich by now. I asked them to offer samples to forum members. If the product is so great, that small incentive would pay back in millions of dollars in a short period of time. I have spent enough money on quack remedies to buy a new car already and remain vigilant when something is suspect. Only the lowest of the low take advantage of desperately ill people.
Once again, I lay out the challenge to the marketers here: Send me a sample and if it works, I will pump your product to epic levels and help them make a fortune helping people get better.....and I will do it all for free.