How's it easier to make 12 million carefully crafted scams without raising anyone's suspicion that the posts aren't legitimate? I could see the scam working on a Viagra blog, but how is it useful to anyone to have copies of what clearly look like a fishy post all over the place, possibly followed up by the real authors calling you out and telling people NOT to buy from you?

Besides, if you're scamming, why not just create a free blog? There are tons of get-rich-quick schemes out there doing just that...