Frankly, I am at loss about how to give an answer whenever I get that query.
Consider day-trading as an exam. Even if we do not know the answer to some of the questions, it is our overall performance that matters. I look at the weekly and monthly earnings rather than the daily earnings.
Let me reiterate - whatever I am using is NOT the holy grail. But through my interactions with seasoned traders, I learnt that they stick with the most simplistic methods - which are already out there. Pivot points, in my humble opinion, is grossly undervalued by the majority of the present day traders. It is of no wonder they come to the conclusion that "day-trading is impossible".