design - Reward for editing a wiki page -

Whenever a wiki edits the page, then I have to get reward points, though not all changes are alike. Creating the first amendment of a document from a blank page is definitely more valuable than inserting a miss comma.

What can be used to define this mechanism, when any change between two document revisions is important? Will one percent difference be enough or better way? How will the percent difference between the two texts count? What will be the threshold of importance? 5% change? 10%?

In me, the programmer says that you can score points in percent ratio change. For example, by possible 10 points, you will get 3 points for 10% change, 6 points for 20% change, and say all 10 points for more than 30% change. The writer inside me says that this is probably not as a clear cut.

In general, I am open to other solutions to solve the problem of giving proper reward based on the level of contribution. This is very important to me, so please forgive the open ended nature of the question.

Edit: Please consider other models except the StackHowflowflow. A wiki model with many authors is very different from a model with a lot of answers, all the people who have answered so far, thanks for them.

Go with a system by which other users, like this site, Reward the author / editors through the system

By telling the documents that only how many documents were changed to create large documents.