Sounds like a cool and easy way to get a little boost for your comic! I'm curious about other's experiences with it.
edit: Seems they don't allow adult content (with no specifications as to what qualifies), which is not unexpected but still a bummer.
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I've also heard people talk about the up-and-coming https://bid.glass/ as a Project Wonderful alternative. I'm not experienced in advertising, so I can't say much about it other than that they have a proven interest in webcomics because they have partnered with Smackjeeves.