The bottom line is that there will always be the people who skrimp and save to take a cruise - and bless their hearts.
If these are good people who just want to have one of the finer things in life, and taking a bottle on board truly makes a difference in their vacation who am I to tell them what to do?
It is against cruise line rules - yes. So don't abuse it. Don't take on three bottles and get obnoxiously drunk. People like that have no excuse for themselves. But if you are reasonable about it, I don't personally care.