Add-on Ads inside forum threads

Is there an add-on that will drop an ad into a thread, in place of a post?

Has anyone done this, and do you think it's a good idea/bad idea? Our users get fixated on content and don't click ads on the fringes of the screen. Some ads we want to make sure they see, but I'm ambivalent about making them quite this intrusive. Opinions?
 
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