Million Dollar Wiki made this concept popular, but it was being used on the web for a long time around (check Pagerank10.co.uk for instance).
These websites sell for a single fee or rent for a recurring fee internal pages on their domain. Usually they have either high Pagerak or high traffic, so that people purchasing a page will be able to benefit in some way.
Implementing this method on a small blog would be difficult, but the concept is interesting and could be explored further.