You've got it right about the $100 balance, but frankly, it's not that hard to get to if you use some simple Search Engine Optimization 2.0 techniques (press releases, articles, among others).
I'd use your primary account until you reach $100 then you can swap your codes for the new account if you so desire.
For starters, try using EDIT(additional) forms of adsense products on your blog. The new video referrals are looking promising, especially considering the type of content on your blog. Also consider doing multiple niche blogs using the same formula (or even change it up, as to compare) and linking them all together.
Keep your chin up - AdSense can be very profitable, it just takes time and practice like anything else

Cheers!