The reason is that they have to be a little conservative with the amount of servers that are available, as we are not talking about a $5,000.00 server, but a large blade server that cost a lot of money, depending on gear needed they can cost about $100,000.00 so it is not a small investment.
And money like that does not grow on trees.
So login problems i was expecting, the 10gig steam update i was not.