I did a back test of SPY from Feb 2007 to Feb 2017 on the above. First column is buy and sell once a day 100 shares of SPY, second column is buy and sell once a month, third column is once a year and the forth column is buy and hold. I assumed a round trip commission of $14 (Typical commission) First row is total profit over 10 years for 100 shares of SPY. Second row is commission costs. Third row is total profit of the different trade strategy. First of all, if you trade without commission, day trading was profitable, probably because of the upward bias of SPY. However once commission was subtracted, random day trading was unprofitable. Notice that swing traders had an easier time.
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Of course no one day trade randomly but for most inexperience day traders (I was one) random trading may not be too far off reality. And, 100 shares of SPY is ~$20,000 unless you go on margins. In my opinion the hurdles are substantial and my hat's off to the professional day traders on ET that can consistently make money month after month, year after year.
Best to all.
Trading single candlesticks has never worked once spreads, commissions are taken into account over the long run. Brokers love candlestick traders.
Only on an internet forum would assuming a consistent return of 25% plus a year be described as "conservative"...