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.
Not only in gambling but on all things you receive unexpected results will thrill you more than what you anticipated, but its more thrilling when it's on gambling because there is an unpected money involved.
I have experienced it on one boxing match when, out of mistake, I bet on an underdog before where I gave up on my chances to win as the underdog was taking a beating, then in the final seconds he scored a win via a last second knockout.
It was unexpected who would have thought that a mistake in a bet would give me unexpected winnings.