Interesting, I've been doing just that for the last couple of years. It's been a mix of partial successes and total failures, mostly failures. I didn't want to go the 'mfa' route for obvious reasons, so I try to make these sites in to something that actually is useful, and that have a sense of community about them. Here is a breakdown of what you can make this way in a month based on adsense alone after several years…
I'd add something else. It's all so very easy to say that you can quickly make a buck a day on the internet. "Sure, just throw together some videos of puppies and put some adsense on there" but that's not the reality of the net today. People and companies are heavily competing on every freaking keyword that anybody might be interested in. That doesn't mean there isn't opportunities, but it's a much longer haul than j…
Note that in that list there are several sites that have millions of pageviews per month (a success by most standards), and in spite of that the monetization simply sucks.
If you were to spread those millions of pageviews across many smaller sites the maintenance headache would be a multiple of what it is right now and you'd still not make more than roughly $1000 / month.
If I lost all the $1 per day sites from the list (or lower) there would be only 5 sites left.