-snippity snap-
I started reading, and started to reject it.
I kept on reading, and I found out what an awesome idea that is.
Maybe rare ores, rarer than diamond. Maybe redstone in advance, like maybe a power source for something.
Something that could assist you, such as programmable guards, types of generators, advanced stuff.
Also, I had this idea the other day.
What if on hardcore mode, if evil mobs hear/see your fort, or something, there would be a random chance that you either,
a. get nothing
b.get a few mobs at your door
c. get a major mob attack
So you'd have to camouflage your fort with dirt, and such. And also prevent any torchlight from escaping.
I'd imagine this could get quite hard to code, however.