They didn't used to because there was no incentive to do anything but a good job.
Now there is an incentive to accumulate metadata. And just like thumbs on Facebook or points on StackOverflow, it will be gamed. It will be trolled.
All you've done is take the incentive of "earn a good reputation by publishing quality work" and open the platform to people who only care about "Ooh, shiny pieces of flair!"