sidinuk,
An interesting observation and I agree with it in the current market. But looking back a bit, a large trend day is quite often followed by another one. There are lots of times in the past where the Dow goes up a lot one day and down a lot the next. There are also lots of times when the trend continues for several days. At the moment the Dow is in a narrow range and doesn't seem to be acting in a typical fashion.
Since the 7/4/03, I can't find a day with a range over 200 points. When the Dow breaks out of this narrow range, it might pay to trade every day again.