yea he can't manage 20 blogs but i'm pretty sure he can manage TWO, which potentially will double his earnings.
I would suggest hiring a forum member or an article writing company to write about 150-200 articles that way you have articles for a whole year for your new site! You can have this done for about $400 probably. Which is only half of what you are making in a month! Good job by the way!
I totally agrees with Justkidding, if you can make it so far to create USD800++ per month, just repeat the process...and success is within your reach.