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In this case the img src traffic is because they're sending you ANYTHING that 404s, including images. If an image on a domain they buy traffic from or control 404s then it shows to the surfer as a broken pic; it's really trying to load a buyer's (HTML) site though.
It could be ignorance on their part - not knowing how to apply a simple filter to get rid of 99% of 404 img srcs - or it could be quite deliberate to increase the volume of traffic. Who knows.
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