I have no idea how the real world works yet you are arguing with a fact that I can easily counteract such as being able to buy a 2$ aluminum product.
The cost of the aluminum after it's been machined? Well then, the white MacBook is .2 pounds heavier than the 13" MBP.
You mess up a piece of aluminum? Funny, I remember Apple SPECIFICALLY stating they get the manufacturing process right every single time oh I don't know...
right here in their unibody video.
So you are assuming things.
I had no idea someone who is 5'11 and has a girlfriend is an angry little person who has to fulfill his life on an internet forum. You on the other hand, seem to have comment on it so often... makes me think you have some insecurity issues.
Easier to recycle, easier to mill and obtain. Also I haven't insulted a single person here.
http://scienceray.com/chemistry/aluminum-vs-plastic/