It would also flood the interface with zillions of orders. It's already bad enough when someone floods it with ridiculous offers. Like 20 public buy offers of 10/100, for 100 bushels each.
The trader game on EC simply doesn't exist right now. The only way to go is lord/steward, and just buy whatever you can, and then resell to know buyers later. The free market will only work with large numbers of both buy and sell, and traders that have significantly longer range than lords.
