Let me first state the obvious by saying that owning any one stock is far more risky than owning the stock market as a whole. BP started the year as one of the most valuable companies on the planet as measured by market capitalization. Yet it was only one company. Markets have stayed pretty flat so far this year, but a 50 percent decline in BP stock would equate to a 5 percent decline if your portfolio had ten stocks. Picking individual stocks increases risk without increasing expected return.
Dividends can lead to disaster
Only two years ago, investors learned the hard way that dividend investing can be hazardous to your wealth. In 2007, high dividend companies were heavily financially oriented and those were the stocks that got slammed the worst. As time passed, and memories faded, those lessons went wasted and investors returned to chasing dividends like a yellow lab after a Frisbee. Though BP paid a great dividend, and we all like income, it's the total return that matters.
The unlikely always happens
Don't confuse the unlikely with the impossible. The collapse of such titans as Enron, Lehman Brothers, and General Motors, could never happen to BP, right? BP, after all, has billions of barrels of proven oil reserves which is money in the bank. Well, even if you believe BP's claim that multiple fail safe systems on the rig failing at the same time was a once in a millennium event, keep in mind that there are hundreds of rigs in our oceans. This fact alone increases the likelihood of at least one failure.
Unlikely events are very likely to continue to happen every day. It's one of the few things that I can actually guarantee.
You need thousands of stocks to build a diversified portfolio and broad index funds will minimize the risk of an unlucky pick. I cash every dividend check I get, but buying mostly high dividend stocks or high yield bonds is a recipe for failure. Finally, build your portfolio knowing that the unlikely will happen. Make sure part of your portfolio has bonds backed by the U.S. Government that can act as a shock absorber every time the unlikely happens.