JT-yes, that is definitely worth it! I have heard "rumors" of upgrades for a nominal fee...but never knew it really happened!
When checking into the AKL with a pool view room reserved, we were upgraded to savannah view. I felt like I was getting along well with the CM, so I casually mentioned upgrading to concierge for $50...that I had heard it had been done before. He acted like I had two heads! He said that never happens, it is impossible and he quoted me some exorbitant price if I wanted to upgrade to CL. So good to know it CAN happen!