It should some some positive and negative trust like what we have in bitcointalk.org so that people might know that those helpers are legit and not selling their reviews,so that the system wont be that easy to crack,because these greedy people will always find there way to make money.
It might not happen, why? Because the helpers will automatically remove from the service if the administration or the lina core will find something fishy with their helper. If the helper will always be given an opportunity to prove herself that she is not paid helper and if the lina review will turn to trust system, I think the helpers will take advantage the system.
In our life, we have only one chance, one opportunity to prove ourselves! That's why death is always the risk of life.
You might be right because if you are one of those helpers,you might find a way to get more profits even if you risk your reputation but lets wait for the developers to come and explain how this system will work.