The reason for this is simply due to the fact that they would loose money. It would be much easier to scam an idiot out of 27k gralates instead of spend 10 dollars, and then somebody that actually did spend 10 dollars looses everything they spent, resulting in many misc. issues. However, we've gotten to the point of using shovels as currency, and that's about the closest your going to get to gralate trading. I'm sorry, while I beleive to some it'd be helpful, its generally a bad idea.