No. There's tons of people (even a lot of teens) who make very good money via AdSense and other CPC/CPM ad networks by creating useful content websites instead of thinking they need $20,000 from an "investor" to build a techie-related website.
But it's also likely that someone inside Google kicked this off by compiling a list of sites which do make that kind of money, then suggesting it to the press.
I.e., the "get-rich-quick" loving press probably had no idea that some (albeit probably very small number of) people make that kind of money from their Google ads until someone from Google told them.