there's definitely something in that - it's also my philosophy. in fact, i can't even follow another strategy, because in my field (news site) there is so much content that could be shown to my users, that as a one-man show i have to restrict the content to something specific not everybody is satisfied with.
on the seo side i try to catch as many different but related visitors as possible with my keywords. i show them selected articles which correspond the best to my beliefs what the site should contain and leave out other articles that i know interest many users as well. thereby focussing on quality to assure to not get the worst case audience, to attract respectable advertisers and for me to keep having fun working.
however, you shouldn't overdo the "missing content" strategy, as you eventually attract less visitors and develop a kind of mfa structure by promising everything and keeping nothing. and we all know that mfas are not sustainable.
[edited by: moTi at 2:18 pm (utc) on Nov. 9, 2006]