I found an error on the cost of materials to buy a warehouse. It should cost 358.81 materials, instead of 3558.81 because I can actually buy the warehouse with 358 materials. Sorry for my english. I hand you the picture: http://puu.sh/gZGyn/2f33c93491.png
Check on the lower right part of your screen, you have 10x button pressed. So it gives you the cost of the next 10 Warehouses ! Since you can buy at least one warehouse buy is enabled though!
Check on the lower right part of your screen, you have 10x button pressed. So it gives you the cost of the next 10 Warehouses ! Since you can buy at least one warehouse buy is enabled though!