Instant satisfaction vs. postponed reward
Why are we so bad at making good choices about our future? Why do we need to get everything now, immediately? Why can't we wait a while longer and enjoy better rewards later?
Given a choice of getting something little right now versus getting something considerably more later it always feels more tempting to get the instant reward. You need it right now. There is no guarantee you want it anymore after a while.
And besides, it's far in the future, surely there are more options coming up later to make things up.