Well, I understand you're fishing and I am in great mood, so I'll pitch a method that works well. 80 free blogs is way too much in the beginning as the setup ie., foundation for (MS) can take up to year if done correctly. You needed to start with 10 free blogs as they will developed over time. Meaning, none of the blogs should ever be created in the same account, email, IP. All separate. You can buy 50 for $100 to your specified niche or do it yourself if you have the time.
Once they're established and built correctly, never have them look the same and blogroll them only in the same niche. Then drop WPMU on an older domain and make sure to turn "off" the public viewing for the members blogs. Then buy CyberSEO full version, easily loaded in WPMU accounts matching the free blogs you've created, pull feeds, wash, and then use another plugin to update the free blogs, depending on the blog service you're using.
Let it work automatically as it pulls feeds, washed them, and then post to your free blog. Then BL the fuck out of the free blog in the correct niche resource. After 3-5 months pull the feed and stop posting on the free blog with a link that you moved to your WPMU blog that you now make public. In short, you just created a perfect feeder as you NEVER link your feeders.
There are other tricks you discover like when to delete the feeder when the heat comes down. The best tool is to get the correct
stats counter for a free blog and look for daily for Google manual checks. They come out of India as most surf on a Mac and if you get one of these, immediately delete the feeder before they escalate the ticket.
Rinse and repeat and in 14 months you have a money making empire depending on what you're selling. Also, as complicated as this sounds, you'll pick up tools to make all this simple to manage and control. But I highly recommend you only go with 10 first because it's just too much to manage as you learn the ropes. In short, the first 10 I set up took a month, as it now takes less then a day.