Yeh, when I read the headline I was skeptical but surprised to find some actual meat in that article.
Regarding the tshirts and some of the approaches mentioned, if you are looking for brainstorming ideas like that you may want to also check out Jenn's Zero Dollars, a Little Talent and 30 Days Series
. That is a bit dated being 5 years ago (geez time flies) but it walks through her hands on experience day by day of trying to implement some of the methods mentioned in the article (such as tshirts, advertising revenue, etc).
Some of the opportunities mentioned for earning money with review sites were new to me. If anyone has done a bit of that I'd be interested in hearing about the experiences and earning potential further. Sounds like a lot of work for what I expect is a little money.