Quick Question About Blog Networks

I'm in the process of laying the foundations for scaling what's been working for me online. I've been building a private blog network to use as part of my SEO strategy for my niche sites. It's already working fantastically, but I'm trying to figure out a few of the intricacies of using it effectively on a large scale.

My question is this: how should you be utilizing your network to avoid creating similar link-profiles for each of your money sites?

Take an extreme example: lets say that you have 100 niche sites. You also have a blog network of 200 sites each on different hosting plans. If you put a link from every blog network site to each of your money sites, that's going to create 100 sites with the same link profiles - and so a big footprint for Google. This is an extreme example but it illustrates the point I'm trying to get at.

I've been told that each of your money sites should be no more than 60% similar, in terms of links from your blog network, to any other of your money sites.

I intend to diversify my link profiles with other forms of link-building but I'd be incredibly grateful for a bit of detailed advice on this from somebody who runs a blog network that links out to a lot of money sites.

Cheers guys,
Dan.