Perhaps WordPress.com should put this quote from Pearsonified.com somewhere on the support pages:
Frankly, I’m sick and tired of reading horrible advice on this subject, and I’m even more sick and tired of responding to people’s questions about Google AdSense, which is quite literally the worst monetization service of all time for people who don’t have millions of pageviews per month. In other words, AdSense ain’t gonna work for you, cowboy.
And anotherone from Dave Winer:
Blogs don't make money. But people with blogs can.
That said, i am the happiest WordPress.com CUSTOMER :) - since i bought the no-ads upgrade.