At least the Google banners aren't CPA (Cost Per Action, meaning Brad gets X amount of money per signup/purchase). Those can earn you shitloads of money, especially directed traffic like the stuff we have here, but it usually just ends up making you wish your costs were lower so you could actually make money.
This shit is my bread and butter now, and I can tell you that smaller sites like Brad's need a shitload of good, focused traffic to make banners really worthwhile. Brad could probably never make enough money off the banners to sustain the site alone. Google, Ask Jeeves, Yahoo, and others of that type make millions off banners alone because they focus a lot of traffic to very specific ads. Search engines are banner GOLD.
In any case, no, I don't think Brad's going to be buying a Porsche with the little fundage he generates off this site, even with donations, banners, and the secret soul-selling campaign link he has running under the in4mador button.
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MADE YOU LOOK!
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Do you want ants? Because that's how you get ants.