An enderman babay,so then you can keep it till it grows bigger,then protect your home lol
think about it,it attacks those who look at them,so it means there will nobody dares to look at your home!!XXXXXD
Nothing but the blocks they're holding.
It's better and lets them stand better on their own.
If they gave a rare block like obsidian, they're no longer scary, which Notch would hate.
People would be charging them like "OMG OBSIDIAN PLOX!" with their eyes crossed behind their pumpkin helmets, sword flinging in the air.
I can just picture it.
The Endermen were designed to be F***ING SCARY! Not some source for easy loot.
Besides, just because it's hard to be beat doesn't mean you're entitled to loot, either. That's just life.