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Throwing money into the wind

http://www.bbc.co.uk/news/video_and_audio/headlines/37262279

The Juno spacecraft will only orbit Jupiter less than 40 times. It will then be crashed into the planet itself to eliminate the possibility of it crashing into one of the Galilean moons, possibly contaminating them as they are a target for future astrobiological studies.
Why cant they do the same thing that they do at Saturn? Cassini spacecraft is still ongoing after arriving at Saturn back in 2004. Cassini will also be crashed into Saturn when its mission is complete, but cant help feel that even without the Titan lander, Cassini was better value. Seems to be throwing money into Jupiters winds ending the mission so soon. Hopefully they will extend the mission as they have done with Cassini.