I'm not really sure how to respond to this.
Firstly, I admit that I have used the dupe bug, or had other players use it on my behalf on multiple occasions. I find it convenient because for me, the thrill is in crafting stuff and creating things rather than spending a lot of time mining for materials. Lazy? Maybe, but I find mining for specific blocks a chore (seriously, I very rarely find iron/gold/diamond).
Same here. The fun of the game for me is the building, whereas mining is absolutely boring as hell, plus all of the decent stuff is rare to find.
Also, you got lucky with the Titanic, as you had the huge hole done easily for you. If we truly wanted a 'play as you are supposed to play' server, then you'd have a lot of digging to do.