^ I'm afraid you missed Karsts' point.. He's trying to tell you, for your idea to be viable for implementation, you need to consider the impact and all the possible consequences for the gameplay and balance. Moreover you need to show numbers. How will it be balanced. How will the players' profit be affected. What trade routes would need to be changed? How do the prices need to be adjusted?
Just throwing out some random nicely written sentences is not enough. It's nice for starting the brainstorming process, but when an idea is agreed upon you need to get to work.
