Living room - i.e. expansion of the Empire. Their home planets are overcrowded and they need room to expand.
Plus they get the benefit of a subjugated race to do their menial work for them and a planet full of resources.
Perhaps they even need the Earth for it's water resources, splitting water for hydrogen as a fuel. (Hmm, seems Targan has already evaluated this aspect)
Then again with the possibilities that there are some incredible amounts of wealth in the asteroids and uninhabited planets in just our solar system, perhaps all they need is an outpost for processing those resources before shipping them back home. The Earth becomes a factory planet because it has all the needed resources - slave labour.
Plus it could be an amusing holiday zone for them, hunting humans in the jungles and so on, you know, light entertainment for the aliens but deadly terror for us.
Last edited by StainlessSteelCynic; 08-31-2011 at 09:02 PM.
Reason: Noted that Targan had already addressed one of my points
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