From RealityBlurred:

Dancing with the Stars, Survivor have the most expensive ads among fall reality TV shows

In its 19th season and the 2nd most profitable reality show on television (at least until "American Idol" starts again), not too shabby. According to that story, "Survivor: Samoa" brings in $152,246 every half-minute. Of course, as the article points out, the dollars that "Survivor" and DWTS bring in is still well below the dollars brought in by the scripted shows.