Simple rule of thumb- x might break it, 10X will really break it.

It's the old debate of armour vs warhead. You'll never be able to make shielding that can't be overloaded by making a bigger warhead. And the bigger bang is always more cost efficent. :P

I'm afraid the high point of my customer service this week was replying to "you people wrote the ******* program" was "well, you bought it two years ago and haven't had a problem before Vista."

Yeah, the boss didn't like that one.