What i would like to see is

NOT 4 separate 150 warehouses, but rather one 600 warehouse; if this is too hard to make with the current system. Then remove the warehouse storage from each individual retainer and add a main warehouse somewhere where the space is increased based on how many retainers you have working for you.

Last but not least, keeping track of crafting mats is a joke/pain in the arse. What i would like to see is something to this effect. http://i.imgur.com/U9uaG.jpg

Now to make it SE style, It should track all crafting materials, gathering materials but ONLY 99 stacks of each, rest have to go into warehouse.

Now you can implement this as an optional service for all i care, I think 300 unique items would be enough and you could charge $3 to $4 for this service. I rather you didn't charge anything for something that should have been included but w.e.

Thoughts?