COST
Having 2 contracts in one city is an additional cost, so that would be taboo at the moment, you know, because times are tough.
Now, let's all ignore the 2 hotel situation in London. (COST!!!)
The other one that always gets mentioned is "Hongcouver". [please note sarcasm]. The trouble with a split there is that most of the non-Honky CC would rather not stay in Richmond either.