I've learned a couple of things from this discussion.

I was about to write that one of the annoying things about tripadvisor's policies is that they discourage including any discussion of hotel room prices in reviews, but I just took a look at the current review guidelines, and I don't see any prohibition there against mentioning prices. I could have sworn that there used to be a rule prohibiting price discussions, but either my memory is just wrong or they have changed that policy. If I am right that that used to be one of their rules, the rule made it hard to compare reviews over time since so many reviewers take price into consideration when judging their experience yet prices change over time.

The other thing I've learned is that tripadvisor does not prohibit business owners from asking guests/customers to write reviews (not that there's much that tripadvisor could do to prevent this from happening if they did have such a rule). There FAQs actually says owners can ask guests/customers to write reviews.