Well, I set up a Cobblestone-Farm to create Cobble for the Recs and somehow the Emergeny-Off didn't work. 50 Stacks of Cobble made the Pipes explode ...
Now, think about, what would have happend, if we noticed it many days later. The massive amount of cobble in the pipes would have lagged the Server to death.
In an empty World, chunkloaders wouldn't do much, but many chunks with much stuff kept loaded could easily corrupt a server.