I noticed some reviewers write quality reviews a lot, and I think they should be rewarded. So here is my suggestion:
Every time a review is labeled as helpful by (#) people, (#) experience points are added to the writer of the review.
This would encourage better reviews in general and provide another method of gaining experience points. I would like your suggestions on how to make this better - for example, the (#) is a space to fill in with an appropriate number. Any other possible variations on this are also welcome.