Despite the possible advantages to Day Trading, the more plausible disadvantages to Day Trading.
Because of the quick, often impulsive purchasing and selling of a currency or stock associated with Day Trading, such a fast and temporary trading of high volumes of money can and usually does backfire onto the Day Trader, resulting in a great loss of money for the day.
Often a Day Trader will hold onto a stock they purchased that is losing value, which results in the stock losing more and more value and the Day Trader taking a serious loss and selling the stock just before it rebounds to balance out the day.
This oscillation of the current stock market serves as much of a disadvantage to Day Traders as it does an advantage. If a Day Trader sells a stock that afterwards gains a great deal of money and then purchases a stock that loses a great deal of value, the Day Trader could, in all reality, be financially destroyed over the course of a few hours or even minutes.
These risks leave very few individuals desiring to implement Day Trading and usually stick with long term investments.