Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
I think some gamble with that feeling, and many bets are made based on that feeling, even though it's clouded by the desire to increase their winnings, which is called greed.
This situation stems from the gambler's personality, which is often described as being confident in a bet.
I place a bet because I'm confident that what I think will be close to reality, even if it's not 100% guaranteed to be the desired outcome.