Going by http://ycombinator.com/newsnews.html HN was seeing 120k uniques as of 2011. This post has been up for an hour, and attracted 105 poll respondents. (120k / 24) is 5000 users, 105 respondents represents about 2% of that.

So either 2% of all HN readers have had their AdSense account banned, or the poll results are a bit noisy :)

(Obviously this is extremely rough math, but allowing for a huge error margin, 0.5% of HN readers would still seem too high, at least to me)

On saying that, AdSense is an enormous program