[detaro]

It still loads the ads and the things they link to, so it spends your bandwidth and CPU power on creating noise/fake signals for the ad networks.

[kbenson]

Ah, so it fights online ad profile generation and tracking from ad networks. That's laudable (and useful).

[detaro]

Profile generation maybe: if it clicks randomly, the ad network doesn't know what's a "good ad" for you

Tracking I'd say less: your browser is loading the ads embedded in various sites and reveals more than if it just blocked.