Quote from nazzdack:
Your buddies are wrong. Higher-volume markets are easier to trade because the high-volume of trade sets in motion trends that are more persistent. Low volume commoditites, such as pork bellies or platinum, should be avoided because they can be "pushed around" more easily.
Volatile an liquid markets will always offer better opportunities. I always avoid stocks that are like the Roach Motel, easy to get in and hard to get out, I guess that same applies on Commodities.