Might be because they don't want to screw up the things later when a possible change can happen! Futuristic?
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Found this interesting.
Past winners of the Champions Trophy.
Wills International Cup (in Bangladesh) 1998/99 South Africa
ICC KnockOut (in Kenya) 2000/01 New Zealand
ICC Champions Trophy (in Sri Lanka) 2002/03 shared
ICC Champions Trophy (in England) 2004 West Indies
ICC Champions Trophy (in India) 2006/07 Australia
ICC Champions Trophy (in South Africa) 2009/10 Australia
ICC Champions Trophy (in England) 2013 India