First, it's a distinct minority of all spam, and filtering puts a frustratingly small dent in the problem. Second,
the bad guys can easily adapt and are already doing so. A few months ago, a lot of the pump-and-dump stock spam messages were purely images, but now spammers often append a bunch of gibberish words or random sentences to the email by placing them underneath the image. Third, traditional antispam solutions can detect image-based spam reasonably well, responding to hashes of the images themselves and the fact that they are spewed out in bulk. Rather than blocking image spam wholesale, we can catch it using traditional antispam filters. So, your idea of filtering them is a good one, but nothing that will put a major dent in the glut of spam.
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