Your idea makes sense, and I don't blame anyone who would block ads out of principle...the right to do that ought to be protected more than someone who desires all of their advertisements to be seen. In regards to JS, you are completely right with it not always beeing spooky shit. The site I moderate, for instance, uses jschan, which I highly doubt does spooky shit behind the scenes, however the reputation of what the code typically is used for definitely sours using it.