This may be true, although the mods aren't robots and can pass up on taking a action and leave it in the queue for someone who does have the capability of taking more serious actions against the account.
My assumption is that it saves everybody work if that "someone" checks one thread with a list of plagiarism once in a while, and bans the perps.
For example, I've reported a few people in the past which I assume were left as I've received messages from cyrus telling me the accounts have been banned a few hours after the initial report.
I have never received any direct feedback on any of the posts I've reported.