Million Dollar Wiki is a popular concept, but it is used on the Internet for a long time around (check Pagerank10.co.uk for example).
These websites for sale or rent one for recurring fee internal pages on the domain. Typically, they have a high Pagerak or high traffic, so that people can take advantage of the purchasing page, in any way.
The implementation of this method on a small blog would be difficult, but the concept is interesting and could be further explored.