Nothing extra. I trade only 1 particular scrip everyday so long as it has good volume and it gives me consistent return. Earlier it was RCOM but then it started to fluctuate beyond my understanding/prediction/intution or whatever, I shifted to Unitech. Unitech is always in the list of most active shares in NSE under volume. Moreover, Unitech has always been special to me as my first trade (delivery basis) in the world of stock market was in Unitech, which gave me a good return.
I agree that there are many other fishes in the sea. But I am trying to fish not for the sheer excitement of fishing but for making it my sole source of income and I believe studying a particular breed of fish would allow me to predict its movement and thereby make my fishing profitable consistently.