I know this is going to sound really pretentious, but I really hate change. So much so that I actually find it more of a pain to pick it up and use it than to leave for someone else to pick up. I'd pick up a quarter, loonie, or toonie if I saw it, but no pennies, nickels, or dimes.
The way I see it: It's a pain in the ass for me, but it could make someone else's day so it's better for everyone.