I can't really blame anyone for making money on what is essentially arbitrage, but the bottom line is that they add no value to the system and they make it harder for legitimate sites to get advertising revenues (by preempting traffic and ad $$).
As far as adding value bit is concerned, if the articles provided are worthwhile to users, then some value is created. (Although I feel very strongly against the idea of creating spammy blogs that he advocates.)
The articles on the real sites are custom written, and he pays a small premium to decent content. (8-12 per it looks like), and in theory are researched a little bit.
He's creating value, then marketing it. A tiny bit spammy w/ the blogs, but it doesn't really hurt anybody (ie. humans won't see the spammy blogs).