It's a responsible decision of you to promote quality over quantity. Coincidentally I was just discussing something similar in another post:

Mathematically speaking, if there is no disincentive discouraging people from abusing the system, a majority will typically gravitate towards abuse since it constitutes the natural Nash equilibrium. (Because even the average honest person will still experience the frustrating comparative disadvantage of not abusing the system and really begin to question his approach)
And -sadly but realistically- the most efficient method in order to condition good behaviour in people is to prevent those easy abusive stategies altogether.