Yeah it's normal and in general doesn't affect the luck of the games we are playing at all nevertheless I believe that emotions also could become one of the factors to encourage winning probabilities. Why? In case someone is carried away by his emotions while gambling I'm pretty sure his calculations or decisions that he made at the time would be mess up the gameplay particularly in several card games such as BJ or poker with certain decks.
I agree.
The connection of emotion and with probabilities explains that sometimes we're overwhelmed and getting carried away because we're too happy with the first result.
And upon feeling that happiness, we might have let some bad decision pass because we miss those little details that we have to decide when we're too happy.