A gimmick...
...nothing else. If this is how Apple wants to drum up their nonexisting iAd revenues then they are banking on the stupidest advertisers only, I think.
As a side note I think Apple has no clue about mobile ad business - they have learned this the hard way during the past year: after big introduction last year it didn't get a single mention at WWDC so it's obviously a huge flop (Steve "Freedom from Porn" Jobs never admits errors.)
Moreover I don't think they actually like his ad-based ecosystem at all - it eats into their super-profitable wallet garden App Store sales. Witness this as new Mail was introduced with "No ads" as a feature and even the Puritan-In-Chief proudly reaffirmed their anti-ad stance:
“No ads,” he boasted. “We build products that we want for ourselves, too, and we just don’t want ads.”
http://www.conversionrater.com/2011/06/07/looks-like-the-iad-hasnt-cracked-mobile-advertising/


