I think FreeBitco.in, could technically generate a lot from advertisement, considering their traffic. But they have opted for no ads, and rightly so. Annoying ads usually scare off the users. The lower the user base, the less companies are willing to pay for ads, and thus advertisement income dries up. Basically, it's the road to bankruptcy, and it's good that FreeBitco.in didn't step on this road of no return.
Who needs ads when you have a signature campaign that does it for you?


Granted, although it's going to be the case that people are going to click on the links being attracted by the words "win $200 every hour" and "free bitcoin" (And come on what kind of newbie would not click on a link that reads free bitcoins on it?), Freebitcoin's been advertised to death over the last several years by handing out their own banners and bbcode on their site so pretty much everyone already knows about them. That's why I'm having such a hard time converting these clicks into signups. I only got 4 signups out of about 300 clicks, and only one signup actually played there, rolling the faucet once.