Entities should not be multiplied beyond necessity.
Microsoft didn't want any 360 shortages.
(I can't believe I am defending MS's business plan)
In case you don't understand the logic of that:
MS thought that if they flooded the market that they could sell to people who originally came to buy a Wii or PS3, which were sold out.
MS doesn't care to be #1, they want to make a profit, they see their business model as investing in future profits.
I would cite regulation, but I know you will simply ignore it.