Origami requires memory and precision... I have neither of those things. Can't be arsed to remember the exact steps, and when you fold the paper a few degrees over, suddenly, the whole thing looks ruined.
Actually it's sorta like mathematics in a way, isn't it..
I did make a hundred cranes on my own before though, as a gift to a friend. The ones at the top were my best, and as it went down it got crappier and crappier until it hardly resembled a crane xD
BUT ORIGAMI IS FUN. JUST TEDIOUS.
(also it's just folded paper, which turns into rubbish eventually.)