PS Now is different than the Cloud computing used in Crackdown. In PS Now if one pauses the game the PS3 virtual machine stays allocated to the user, while in Crackdown the Cloud gets used only when needed (like when an explosion needs to be computed).
So it's a matter of statistics. In PS Now a bit more than the theoretical power of a PS3 (let's say 350-400GFLOPS) is reserved 100% of times, even if idle. In Crackdown the servers run the simulations only when requested and thus for each user the Cloud gets used only in a small percentage of the user's gameplay time.
Still there is no doubt that even if it's owned by MS it has a significant cost. MS doesn't get the servers for free. Every server in Azure used by XBL is a server less available to commercial customers. The bandwidth instead could be negligible, sure much less than the one used by PS Now (again, for each user).
Oh, PlayStation Vue is yet again another thing. It's more like Netflix. Lot of bandwidth, little CPU time.
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