Both Seagnoids comment and Targets answer are great and correct.
I just wanted to add that the counters are mostly added due to these reasons:
- Show others that the checker is regularly used.
- Grant PGC points to the script and tag owners.
- Make it look advanced and awesome. :)
While I do realize that it may look wrong to published a new Challenge where the checker already says 3 green, 4 red will look strange, I think users will soon understand that it's standard procedure. With the new challenge guidelines we will soon see that every published will have a few green and a few red in the checker, since the reviewers will test run it on a few people.