I first bought bitcoin when it was $1. My motivation was anger and revenge. I was angry that none of the bankers who crashed the system were going to jail. Dammed if I was going to give them any of my hard earned savings. I was so strapped that it was really hard to afford those first coins and exciting to sell them when they went from $1 to $5! Needless to say I paid a lot more for the coin I hold now, but the basic motivation is the same: to stick it to the man.