Correct time to advertise Nifty 50 ETF was when the market was below 8000 in nifty....but at that price all investors are running for their life so no one will have courage to invest and see the market dip by 5-6 % further but reward to risk is great at that point......when investors learn to invest in good stocks when everything is looking hopeless, they make big money. Also they should be willing to lighten their holdings when the market is over-extended....without feeling bad if the stocks they sell go up few more points.......this cycle repeats with clockwork precision in the markets.