[slg]

You aren't replacing whitespace there. You are inserting an ad in the middle of your content. You also aren't making the ad visually distinctive from the comment. If there was an ad at the end of your comment and it was all in italics, would that be distracting or would it be easily ignored?

[Zababa]

Considering most ads are more visually striking than the content they're being put in, I think putting the ads in the middle of the content itself is a good way to simulate that on a text-only website like hacker news. Also, ads are often on the top or at the side, not at the bottom. But let's try it and find out. Edit: I think this is still distracting, but that may be because italics is often used for emphasis on HN. I wouldn't call it very distracting though. It's a slight annoyance. But it does make things a bit worse.

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