[MRM]

Because the Dow was created by Dow Jones as a marketing device and marketed as a trademarked brand so it was the first "index" to gain popularity. It's also the oldest so it's the most well known and it's the most prestigious because it's limited to the 30 bluest of blue chips. Finally, it is designed to be a reflection of the overall health of the economy with its weighted average rather than a true index like the S&P 500. But in reality, it's just more fun to follow the Dow rather than the S&P 500. It's the sexy index.