[Dazarath]

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Why some players are willing to play one hand in a position, and not another in a another position when they return the same.

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This is where your whole discussion goes awry. If you read some of the previous posts, you'll see that this is ridiculous. Your example is AJo UTG and K9s in the CO. You're saying that AJo UTG and K9s in the CO have the same ROI. And then you're saying that players will play AJo UTG but not K9s in the CO.

IF they both have the same ROI and IF it's positive and IF that fact is known, then players will play them both. It's much more likely though, that AJo UTG and K9s in the CO do NOT have the same ROI, and there's where your assumption falls apart.

I'm personally playing AJo UTG 100% of the time whereas K9s in the CO is dependent on other factors (raises, limpers, etc). I think the problem is that you're making the assumption that AJo UTG and K9s in the CO both return 10%, based only on these simulations.

When you play a hand in the CO, there are many factors you need to take into account. Even IF K9s returns 10% on average, there are situations where it will be -EV and there are situations where it will be +EV. For example, if a 10/3/1 and a 15/5/2 limp in EP, you have to fold your K9s. If four 40/10/2 players limp, it's throwing away potential money to fold.