The Apple upgrade cost to 1TB is also $200.

Right, but the link was for 2TB at the same speed, and it's a $600 upgrade for 2TB from 512, which means literally $800 for 2TB in total, plus tax! To be fair, it is likely higher quality, more efficient maybe, but I just think it's quite a reach to charge $800 USD for 2TB of storage that's not uniquely fast or anything. If you think that's a good value, it certainly might be depending on your work, but it would be twice as good value if it wasn't twice the price as off-the-shelf.