Ok, I'll bite and give you some advice
Blogs have been done, some say they have been overdone, but I am not of that opinion. There are a lot of people who just make a shitload of blogs using feeds, they work their ass off for 3 weeks, then they skip a day in week 4, by week 12, they are skipping every other day and within 6 months you are hanging out on boards all day and working is something you will do tomorrow, next week, next month...you get the picture.
Doing what you want to do will require you to do boring work repeatedly for hours daily, with little compensation for a good while. Not everyone can do that. There are a lot of people in this business who fail not because they don't have the ideas, or the brains but fail simply because they can't tolerate boredom.
My advice is to start off smaller. Rather than 100 sites that update only every 10 days, start with 10 sites that are updated daily. Daily updates will help with traffic and placement. Microniche your blogs, and seek out the smaller niches where content and information is harder to find. You can build up a following. Once you are sure you can handle the 10 blogs being updated daily and you are in the swing of things, not feeling overwhelmed and able to knock out the unique content for it daily, then start adding additional blogs slowly, at a rate of 1 or 2 per week so you never feel swamped.
You can have a hundred people telling you to do it, or not to do it, but honestly, you have to ask yourself if you can handle the reality of it and whether you have the stamina. Good luck!