It is like anything i beleive, you cant just toss traffic at it and have it magically convert, you want to filter it down and only shoot for the targeted traffic.
Heres an example of stats from 2 small blogs i run, one getting hits from yahoo and the other getting hits from yahoo and google.
Both these are hits from the 15th and 16th til today, and for only 2 blogs.
This is a squirting blog, i dont update it and is basically just a static site, what makes it kind of cool is its on bloggers, free host, something started as kind of a test. This was a slow week on it, it usually converts at about 1/25 join page clicks.
And then this one with alot less traffic but strictly from the search engine yahoo. I often login to see only 10-15 hits to flashcash with one or 2 sales.
Now this one has 2 more sales down beneath what ive cut but it gives a excellent example of HOW they should convert if you use your head.
I think that if you follow the true form of the blog and not make it a glorified tgp, thats when you can begin to reap the rewards of it. Just like anything else, it all depends what your main traffic source is. And how well you can sell them when they get there.
One thing i can assure you of is all you'll find on them blogs is one or 2 pictures to presell and links to the sponsor, coupled with some quality text, and its in the bag. No-ones beating off to these pages, they have to pay for that.
If you update regular and give them a few galleries or videos, in 3 weeks you would have enough content for them to whack off too for a month. Fuck them, give them a couple QUALITY pictures and send them to the tour or trailers.