That's not really answering the question, is it? Increasing density just means you get to buy fewer servers. It doesn't deal with the problem of everyone on a maxed-out server asking for an increase at the same time.
That's the difference between guaranteed capacity and most services. It's very common to use the properties of normal usage patterns and pool the excess capacity. The phone system has done that for ages. Ever try to make a call during an emergency?
Just because their service doesn't cover certain extreme situations does not mean it's worthless. It would worth knowing how much excess capacity they are pooling together, but vendors generally won't release those types of details.
I supposed that's the point I was working towards: they must be overcommitted, so it's a funny thing to be cagey about. The exact numbers don't matter as much.
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