I've never really observed that. Actually, my impression has always been that there's a profusion of firehose-style group blogs like Huffington Post or the Daily Kos (with LessWrong being an unusually successful version of these), but that slow, thoughtful, non-instant-response, essay-format content like More Right's present lineup can be hard to find. The only thing I'd suggest regarding content volume is that regular, frequent updates would be helpful.