See, not necessarily..
Some of us may (or may not) have seen that all too common brute force ssh attacks where random usernames are used and multiple guessed passwords attempted. What everyone is doing here is potentially giving the people that write these scripts KNOWN GOOD USERNAMES. I'm sure I don't need to elaborate too much on how this is a Bad Thing. Yes, it is somewhat paranoid, but I attempt to protect my boxes that are attached to the world, does Joe Public, whose posted username is "joeyp"?