Your best game vs. your actual game

[Avicenna]

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$250 per four hour session

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Poster means $60 per hour.
The stakes aren't clear either. Do we talk about NL100, NL200, NL300 (if that exists), or a huge game with blinds of $100 and $300 ?
At NL200, $60/hr is 15 PTBB/hr. Good.

I guess that the question can be rephrased also: How do I quantify my errors? This is similar to: Is there room for improvement in my game?

I can answer the last question, at least for my game. Since my winning rate is half way towards the best posters of this forum (excluding outliers and outright liars), then my mistakes have a cost similar to my current winnings. That leaves a lot of room for improvement, isn't it?