Forum Moderators: Robert Charlton & goodroi
Ultimately, for a page to range on anything competitive, it's got to have content that's actually about your target phrases, and that's good enough to attract relevant inbound links. If your optimizing terms are hidden and you don't have link-worthy content, it's not likely that potential linkers will know what your page is about, let alone link to it.
And Google... which is developing various kinds of linguistic analysis... isn't likely to see an assortment of 50-80 phrases to actually be about anything.
Don't just scatter key phrases any old place. You'll get farther with both SEO and Adsense if your pages have a really tight focus.