I don't know about any other person but personally, I've come to discover that winnings that are unexpected excites the most than the winnings that are expected, regardless of the amount of money involved.
Literally, anything gotten out of surprise, the excitement and joy is higher than the one you are already aware of and overall, most winnings in gambling comes unexpectedly. I have won several bets unexpectedly and I know the joy that comes along with it. For me there's is nothing like expected winning regardless of how sure you are about winning the bet. If people expects a winning with full confidence I think most winnings would be huge because since they expected the bet to win they will definitely stake with higher amounts to win huge.