Well, he could put ads on the page but most of the target audience would be using some sort of adblocker. Which brings another question... aren't people overly sensitive to the display of ads? They want good quality content, but don't want to pay for that same content and at the same time block the author's alternative of not charging for it (by using ads) I would understand if we were still in the 90's and there were pop-ups everywhere, but nowadays I find most of the ads non-obtrusive.

Sorry I went off-topic. Another way to monetize would be to make an app out of it for the mobile devices.