I use to know a guy who was a big time day traded. Said for it to really be worth your while you need to have at least 50k a day in trades. The guy would drive himself nuts. Think of it this way, if you lose 50k trading today, that means tomorrow you not only need 50k to make the days trades, but you also need to make up the 50k you lost yesterday. He was very sucessful when he was up, but when he was down I think he claimed bankruptcy 5-6 times and he is only in his mid 60s now....
Im young and mosty in DRIPS and other long term stocks and I had the low yeilds on the short, but its a heck of a lot better than the bank interest rates and I always tell my older buddies that I want to get my hands on some big money making stocks and they all say with high reward comes high risk, so you better be prepared to lose whatever you want to risk.