it is possible that the advertising revenue could corrupt the review approval process which even now is less than perfect. although the incentive of 15 days of membership is tiny some folks are cheap enough to scam VIP this way.

fake reviews slip by. i think that some non fake reviews sometimes get flagged as fraud too.

having provider ads would incentivize having positive reviews for the ladies that chose to advertise. if a review site is going to even have a decent pretense of honesty incentives have to be minimized.