Personally, I think the tool exchange suks. The "random" algorithm's isn't as random as "they" would have you believe. And whoever came up with the game color splash should be fired. It's total garbage.
I've only been playing TS for about 5 months now. Up to now, except for the last month, I have enjoyed playing. In my opinion, what the Dev's should consider doing is making a separate site or building for construction materials, especially if they are going to require the ridiculous amounts just to fabricate one CB or ZI.