We don’t like to lose things. If a choice entails some loss, we recoil from it. Such recoiling can make us miss out on choices that involve initial losses but lead to eventual gains.
Tom Hanks' famous line in Forrest Gump is quite accurate. “Life is like a box of chocolates” he said, “you never know what you’re gonna get!”
We are all innately pleasure-seeking whatever we do, we do it for gaining pleasure. But pleasure has a peculiar nature it eludes those who pursue it as their exclusive purpose.