TIEro, that sounds like a lot of work! I do like the idea of focusing on the information crowd. Definitely less updating required. How long have you been running those blogs and have they been profitable?
About a year and no, they're not. That's mostly because of three things:
(a) I didn't know what I was doing with keyword research. (I'm better at that now)
(b) I didn't know what I was doing with niche sites. (I learned a lot)
(c) It turns out I suck at niche sites, anyway!
(Edit: a fourth thing is that I did it during 2012, when Panda, Penguin and EMD hit and screwed up the basic formula completely, which didn't help but isn't really to blame.)
That's why I suggested starting slow: I didn't and basically just threw away a ton of money because I was learning as I went along. Take the time to learn beforehand and focus on a couple to find your feet and find what works for you.
Oh, one extra tip: just about all the stupid "How to" courses, schemes and ebooks talk complete crap. They don't even lay down some of the fundamentals - like the difference between the buying and educational markets, the different types of niche approach (too long to explain here: read
this for a quick summary) or anything else. They're mostly created by complete retards who earn money selling their ebooks to noobs rather than actually having a clue what they're talking about. (No, I didn't buy any but I did get freebies.)
Do your own research, draw your own conclusions. You'll do a lot better.
Oh, and feel free to ask if I might know something... but y'know, don't take it as scripture or anything because of (c) above!