This seems like a perfect use case for advertising. Need to watch/see ads every 15 minutes for continued use. As long as the ad revenue exceeds operations cost.
But as pointed out elsewhere in this thread, the people who purchase $20 are not likely the type of people who advertisers are interested in, since they don't have much disposable money.
Now if he finds another way to profit off of these users beyond advertising or just spamming twitter, then could be successful.
