They won't decrease your accuracy unless they are marked as bad. The reports are neutral until they've been handled in one way or another.
So there isn't neutral reports? If a person reports a post for moving a thread to Project Development but the staff moved it to Digital Goods. So is that post good or bad?
The mistake he did was the way he saw it:
You did report it, but it was still pending/unhandled, though one had been moved. Both of those do belong in digital goods. There's always going to be some overlap with project development and service announcements, same with trading discussion and service discussion, so there's no fine line. Some threads would fit fine in either, downside of board based forums. I agree with what Shorena said though.
-MZ
IIRC BadBear once said that he handles most reports as "good" even when they are not 100% correct. E.g. if you say "should be in digital goods" but its moved into servies (or similar). It is still a good report as the report made the mods aware of a post in the wrong section and they acted upon it.