Let me explain my mockery: no one knows what the stock market is going to do next and, as I've argued time and again, ordinary investors shouldn't particularly care. Sure, some of us like to pretend that all of this 1) matters a great deal, and 2) can be figured out with a moderate amount of concentrated thought. Take, for example, my story from yesterday about how the rally might be running out of steam. Yet in the bright light of day, most people will admit that what the stock market does in any given session isn't all that significant -- even if it crosses a threshold that seems like it should be really important for creatures that count in base 10. Here are some more reasons not to care about Dow 10,000: 1. This isn't your father's Dow. Or even your Dow. Remember back in June when we took Citigroup and General Motors out of the Dow and put in Travelers and Cisco? We're comparing apples to rotten apples here. If GM were still in the Dow, coming off its post-Cash for Clunkers high, do you think we'd be talking Dow 10,000? I doubt it. In a way, we've stacked the deck. 2. The Dow isn't terribly important to people who actually do things with money. "Dow 10,000? looks great in a headline, but very few professional investors pay the Dow much mind. We are talking about only 30 stocks, after all. Fund managers tend to care much more