Strategies always work positive (at least for me!), but I found that you need to understand the policy or the strategy before you execute or implement. Whether it is spread or average, based on market moment you would be able to gain.
Few strategies work for few stocks, but that doesnt mean you could use the same for all. This is my own perception, I could be wrong, but so far thats what I have analyzed. BOB, IFCI, Kotak or SBI, every stock has its own advantage and disadvantages (P/E, BV, Management, FG etc.). You must understand the pulse of that scrip, before you place your hard earned money on that.
I suppose the author is trying to explain his strategy of money making by exemplifying few scrips. I dont see any harm with that. The bottom line is that you look for a way to make good decision in financial markets. Money follows you if you are good at making right decisions. In fact, it is also true that there are so many people want to share their knowledge in this forum. FEW of them are really GOOD.
Cheers
VG