AdFly-ers: Why Does AdFly Make "Interstitial" the Default ReDirect?

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NOTE: This IS NOT an ad for AdFly! Really, the rewards it offers (something like a percent-of-a-percent-of-a-percent) are too small to use it if you don't already have a huge network of readers/friends you share links with. It's a program that offers you advertisers' money if you use it to redirect your links through either a full-page ad (interstitial) that then directs your friends to the original link, or a frame that displays your original link underneath an advertiser's banner. They provide a 'AdFly This'-bookmarklet you can add to your browser, that will automatically take whatever page you're on and (after letting you log into your AdFly account) write you a redirect to that page; but by-default it makes the redirect an interstitial (making it like you're adding a 'commercial-break' before the page you're looking at, rather than adding a little ad at the top). I think I know why they do that: because people are obsessed with knowing 'exactly who/how-many is/are looking at their web-material,' and the frame-program sorta messes with the counters there. But so? I don't think any of the common users out there are thinking about "how much the writers are getting paid," do you? Why not guide their default-policy by the readers' wants (rather than the advertisers')?