If you have an entire club of XXX sex fest freaks, you could likely easily get fake reviews by having your other club members sign up for AirBNB, all "stay" at each others places, and all leave positive reviews for each other.
The tough part is convincing one of them to get verified before destroying someone's apartment. It's pretty hard to walk away from the damages after giving up your payment info, a copy of your drivers license, and a link to an established (not newly created) social media profile on Facebook or LinkedIn, which are part of AirBNB's verification.