Originally posted by chasinfla
funny. I find that ignoring my conviction is pretty costly. Opinion is one thing, conviction is something else completely. I think some think the two are synonymous.
when it comes to the markets, they both amount to the same thing. in my opinion.... (or, wait a sec, i'm convinced that's the case

)
daytrader, imo, with some types of trades there can be a point where you feel the stock might adversely move, but rather than waiting for it to move there, you enter early because you don't wanna miss the move. in those cases it MIGHT (although i don't do it) make good sense to add to your position, and that way still participate if the stock does make the move you expected.
also, if the market is going in the direction of your conviction, but your stock just made an adverse move, i guess you could feel justified in adding more at that point (again, i don't do this).
you're right that sometimes in adding more and the stock finally makes its move, it can really pay off (i started trading like this, most of it paid off and i thought i was a genius), but i've found that the times it doesn't can absolutely kill you. also, by staying in with bigger size than you normally handle, i think there's a tendency to just sit there hoping, rather than trading on objective analysis of the moment. i've found that when i done this, i'd often look back and realise what a fantastic oppurtunity i missed in the opposite direction, all because of this conviction of mine that the stock HAD to do X.