At the risk of being an unpopular opinion, advertising has been a huge boon in the growth of the Internet.<p>I dislike the ad crazy "news" sites that bombard you and destroy the entire user-experience, but I would equate a not-too-intrusive advertisement as being not an obnoxious thing, and something that allows you to get something, not totally for free, but at the cost of a second of your attention. I'm sure popular ad-supported sites would be not so popular if suddenly put behind paywalls. Much much less seen.<p>About donations, I would look to the experience of those disappointed folks who hoped to recoup some costs waiting for donations. Also, I would equate begging for donations and ads. I love wikipedia for instance but the donation begging can be just as obnoxious as intrusive ads.