I know on my server (Diabolos) the number of bots just totally outweighs the ability to report them all. In just one smallish area, there was 30+ bots. Many were underground most the time just teleporting from node to node. I reported several, but after an hour of filling out cheat reports gave up. I don't want to spend my entire time online just trying to report these bots using the slow, cumbersome tools we have.
Just one GM in the area could have banned them all in less time than it took me to report those I did.