I think post #8 indicates that you can each bring more than one bottle per person and each bottle will be charged $20. So, you are not limited to one bottle per person. Not sure what is "excessive" or what the "limitations" are. So I think you can bring a case of wine on and it will be charged the same as if you split it between the members of your group.
Also, those who have cruised more recently than me can confirm, but I think that you can also bring bottles of wine on board when in ports and they will also be charged $20. Not sure if they are held 'til the end of the cruise or you can enjoy them when you bring them on board. Have a great time. Cherie