Poser. 99.99999% of them are posers. If they get lucky they read about some security flaw on the net before vbulletin gets a patch out, and they get into a few sites to do some defacing. Other than that, yawn.
DoS attacks on you hosting service is really all you have to worry about, and if you have a good hosting service they'll deal with that for you. You'll know if you have a bad hosting service because they'll just shut you down saying your site is overloading.
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