I do a mixture of stuff ranging from a single url per site/account up to a max of 10 urls per site/account....i then create typically 3k Pins per account and publish them at 48/day...after they are all used in roughly 60 days, I rehash the images and randomize the descriptions for the next 60 day period....
Most of my money sites are large auto-generated content sites....so there is always plenty of urls to use, and as Pinterest web-crawlers now deep crawl your money sites, you need to have plenty of content to keep them happy.
