[Severed Hand of Skywalker]

I see ads for them on just about every large Mac website (and even small crappy ones like MOSR).
Fine, I click the ad and get this:

"We're sorry - this feature is not compatible with Macs."

Talk about wasted advertising dollars.

[E's Lil Theorem]

Originally posted by Severed Hand of Skywalker:
...

Talk about wasted advertising dollars.

Well, I don't have actual numbers in front of me, but I'd be willing to bet that a large portion of visitors to most Mac sites are on Windows machines (think people at work). You know, large enough to make it worth their while anyway.

[hyperb0le]

To my knowledge, websites that advertise using banner ads do not choose which websites to advertise on. They pay an ad-distributing company, which then buys ad space on various sites. That is why so many banner ads are irrelevant to the page's content.

[CharlesS]

At my university's library, there's a sign warning people not to go to the "free smiley" sites using the library computers, because these sites open up back doors through Windows IE to install spyware on your computer. Given this, I can give you a decent clue why these sites wouldn't work on Macs...