We've seen it all. People slamming back as many as possible as soon as they board and others who drink moderately even with the package. On Wonder in Jan on the second leg of our b2b, there was a couple sitting up near the entrance area (just past the handwashing station) every morning at a bistro table. Every, single, morning, he had a bloody Mary and she had a glass of wine. Wine with eggs and bacon, etc? Yuck lol.
We've never bought a drink package in 40 cruises. We carried on wine for a while and we made D pretty quickly so then used the DL in the evenings and usually had no more than one drink during the day that we paid for. Now, we get 5 free drinks a day and 3 bottles of wine (525+ amenities). We don't even use all of the 5 per day.
What I don't get is the mentality that when buying the drinks package, you don't have to keep track of or worry about what you spend. Odds are, most people wouldn't drink as much if they didn't have the package because they're only drinking as much to try to get their "money's worth". As I've said on other threads, Royal wouldn't sell the package if it wasn't really profitable for them. They're not selling it for the cruisers benefit.