Maybe you need to consider the post of technology evangelist which tells us that

Digg users don’t click ads. Why does this matter? Because Digg users are sophisticated web users.

As more web users become as sophisticated as today’s Digg users, click through rates will plummet. (source)

In other words, whenever your blogposts are sent to the frontpage of the Digg, your blog will experience bad digg effect like:

1. Lose your bandwidth which will led you to buy more bandwidth from your host
2. Lose your Adsense earnings, because Digg users sent to your blog are not ad clickers and therefore your CTR will dive deeply.

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