I have a number of blogs now lol - however there's one that makes great sales and it's kind of quantity AND quality...
I have a lot of different sponsors on there all in the similar niche (arty babes) and rather than just using them in posts I have built the blog outwards making a different page for each sponsor - the page is like a mini tgp - as in 4 to 6 thumbs a couple of banners and some tight text...
So for me quantity is not just the amount of posts or sponsors - but constantly building the blog outwards using the page function
