When I made the site I debated whether to include frames or not. The justification I used was that I as a user (not just the creator of the site) would actually want a small toolbar that would allow me to navigate quickly between aggregated sites (it aggregates image sites, so I tend to move quickly between pages), and view the sometimes funny captions people give the images.

I can understand your annoyance though. Content creators should have a choice whether to be framed or not... and they do, but like you said not a lot of people know about framing sites and/or how to break them.