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i know this is flawed logic and someone will point it out, but, i like to separate my buy in with my profit. it just lets me know how well i'm doing. i try not to let it affect my play though.

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Furthermore, this is a reflection with a results-oriented definition of winning. It doesn't matter what you started with. It only matters how much you have now in relation to the pot and other players (in an NL game). In a fixed limit game, it doesn't matter at all, since your stack is basically equal to your entire BR unless you are so low in chips that you are all-in.

"Profit" is a fictional concept during the game, since it is only a snapshot of your long term results.

It's not the seperate stacks that affect your play; it's knowing how much you bought in for that does.