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[Husar]

So, millions of hard workers are being robbed of their efforts, yet demographics show that in terms of online spending firefox users are too small a userbase to matter anyway. So if this is the case, what are they worried about?

Is this a joke?

It's probably a bit like going to an amusement park and telling the guy at the entrance that you'd like to get in for free since you're unlikely to use any of their attractions anyway.
Some ads are paid for on a pay-per-view basis IIRC so if you'll never see it, the webpage owner won't get his money from the advertising company, whether you'd click it or not is irrelevant in that case.

I agree that spyware is bad, but if it just says "hello, buy my product please" somewhere on the right side instead of displaying just a white box, what's so much worse?