Some members put a +1 several times for the same ad. And some flood and swells their reputation. So I would limit it, I have more than 13,000 members and I would like to limit it. A one per member per ad.
Will give you an update on your application? If yes, when and what do you add to it ?
Some ideas for you:
Can delete mass evaluations when a banned member
To see prevent duplication if desired or may be able to view
Possibility of Close/ move topic if the evaluation was given