I have files on my site which people can download, which they can do by clicking the download link for the respective file. Now I have the option of redirecting them to a downloads page, where they are forced to wait 5 seconds before their download starts and have to stare at 3 Adsense ad units. Or, they simply get an AdFly link, which after clicking "Skip Ad", starts their download. AdFly so far has been making 2$ per 1000 downloads. What would bring more revenue?