I don't know anything about "buying up" but I do know that we always try to book what is called a "Guarantee" or a "Run of the ship". This means that you pay for the very lowest cabin category early on (months in advance). You do not reserve a particular cabin. You agree to take whatever cabin they assign you to. Then you hope for an upgrade when you arrive at the ship. We have always gotten an upgrade and we have done this several times on different cruise lines. Once we got a 7-category upgrade at no extra charge! What's the worst that can happen....You will get a cabin in the lowest category, which is what you paid for anyway. Beside, once you exit your cabin, you are on the exact same ship as everyone else.
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