MFA is kind of a dumb term; in a sense all of us monetizing with AdSense are MFA, and just because a site was created with AdSense in mind doesn't mean it doesn't provide value.
But the true MFA, where some bottom feeder plotzes a bunch of RSS feeds, or scrapes or spins other people's content in order to make a few pennies off long tail search terms - that's more problematic.
I'm no fan of eHow by a longshot, but they do provide value to some people. People do click on, read, and keep their content, no matter where it comes from. I keep finding printouts of their articles on the desks of clients and even my 81yr old mother, and as long as that happens, they're probably going to keep going.