You'll note my phrasing was "can get a lot of mileage out of" and not "never need anything more than"; that was for a reason. If you pick up a particular spamme

You'll note my phrasing was "can get a lot of mileage out of" and not "never need anything more than"; that was for a reason. If you pick up a particular spammer, with the toolset they have, who either has a personal reason to attack you, or who notices that you have a lot more Google juice than you realize, or even just misidentifies you as a large site for whatever reason, obviously they'll blow right through something as trivial as this. It is far from solid protection. However, it does quite often work for extended periods of time, and for someone running a small site, it's worth it to try this out before going to something crazier because there's a decent chance it'll work. There are sites I frequent where such simple things have been working for years. It's so easy, that if it doesn't work, there isn't much time wasted. Very good bang for the buck, even if it is not even remotely a guaranteed solution for everybody.