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This was a better comment than your original sarcastic comment - the internet’s got enough vitriol, please don’t add to it.

Except this formula is exactly how businesses determine what operating systems, browsers, and devices they support are.

They plug the numbers into the formula and see "If we block IE11 users from being able to use the site, we lose 1% of our traffic, which equates to X dollars. Is that a substantial amount? If so, we support IE11, if not, IE11 support goes out the door."

So yeah, you can plug in the numbers you did and try to negate his argument, but that doesn't make his argument wrong. Just means you understand the argument but fail to accept it.

1. It's weird that the values you pick lead to an example scenario where the person you're disagreeing with is even more right.

2. The point of the math was to show that it's a big deal for basically any reasonable values. It doesn't depend on the exact numbers.