The benefit is:
1. It is a stock like any other stock and you now about them don't you? You buy shares of the ETF stock instead of a futures contract, this eliminates margin and unlimited risk you have in commodities, futures contracts and no maintaince calls.
2.The ETF trade along with the futures thus the stocks rise or fall like the chart Trades posted in corn.
3. You can hold the stock and not worry about stop loss so much like in a volatile futures market.
4. You can get rich over night, hmmm well maybe not lol
5. now you dumb hillbilly if you need to repeat the above knock your self out, leave the moon shine along sober up your got it? ..... just kidding
Now I am sure Trades will correct me if I am wrong.