[Soultrader]

Taking it into account that you are profitable trading the emini S&P, I do believe specializing can generate enough money to provide a living. However, no matter how good of a trader you are, trading small lots can become a problem. A trader trading 1 lots will have a hard time living off 2 points a day than someone trading a 100 lot.

The YM moves similary to the ES. On any given day the YM will have a 50 point minimum range. More common are ranges within 50-100 points. I do believe that one can trade for a living with index futures only. Of course there are days when the markets do absolutely nothing like on Sept. 6, 2006.

I do think it is a matter of a traders satisfaction. I have no problem trading the dow only while others may find the need to trade other markets.

As long as you are able to trade one market profitably, I do think one has the ability to trade any other market successfully. All that is required is observation of the underlying instrument to understand its personality.

I think the problem with alot of traders is that they jump around too much from one market to another without truly being an expertise in one market.