FYI, we've had this system[1] at Twisted[2] for a long time, and that hasn't really happened. When it was first introduced, I argued that it might lead people to review too much; then Glyph counterargued that that's a feature, not a bug. History's proven him right.
It could be that because it's an open source project, and most development on it is by volunteers, that that mechanic is less strong: it's not like people collect bonuses or anything because of their scores... Nor would I suggest that in any other context :)
[1]: https://twistedmatrix.com/highscores/ [2]: https://twistedmatrix.com/trac/
Just make sure this is what you want.
Edit: Meaning, we don't sell software, but we need software to run our day to day.
:-)
[1]: https://twistedmatrix.com/highscores/ [2]: https://github.com/leereilly/github-high-scores/, also https://github.com/kans/highscores
