How to move from one service that is out of your control to another service that is out of your control.
Not disagreeing, but this is quite an expression.
It gives you flexibility if the provider isn't keeping pace with the market and it prevents the provider from jacking prices relative to its competitors.
Vendor lockin is awful. Hypothetically, imagine how stuffed you'd be if your core virtualisation provider jacked prices 500%! You'd be really hurting.
...ohwait.