I don't have a blog network or anything but I use blogs with static sites and also in as full blog sites. I'm building up my own system to earning from Amazon. nothing new. a site/blog networked centered on couple of main sites. I have around 100 domains. So I guess I have like 25 WP blogs at least. Some some blogger blogs.
If I remember correctly Corey Rudl died in a Porsche car crash. He earned millions using IM techniques in early days of internet.