I dunno. I just try my best to be fair as I'm in a different country than where I come from so I try to "Fit in" and do the "Norm" that everyone else does. Again, maybe my porter tipping is now outdated from my 2006 homework
We usually have 3 bags, and based on my scheme above, I would give them $4. But being so close to $5 anyway, I think I might have given them $5 for 3 bags.
I must be doing something right if there's a "Good tip" and a "Bad tip" luggage pile because after 5 cruises with Carnival, my luggage has always arrived at my room, in good condition, and the "12-pack" in every suitcase is still there