It would be foolish to think that everyone follows the same strategy, it would be better to say that we all have the same goal, to make a profit! But how we get to that profit is a different story for each of us!
I don't agree that it is not kind of foolishness because we are all working for making profits by buying at cheaper levels and then selling at higher levels which makes some people are assuming like we are all into same kind of strategy; and I am not seeing any wrong with that.
When you sell someone is buying! Your sell strategy is someone's buying strategy! So it's foolish to think that everyone follows the same strategy!
I can't simplify this anymore, I hope you understand now what I wanted to say! Each of us is trying something, but our tries differ from each other, and that is a fact! I explained above why!
You don't see any wrong when you buy low and sell high! But someone bought that high and sold that low, so from his perspective everything is the opposite!
Good luck, I hope I cleared some things for you!