The thing I find remarkable about this, is that the Fuel Rats aren't a game feature. There are no rewards for being a fuel rat (in fact, it's policy to refuse payment if the recuee offers), except the intrinsic reward of helping people have a nice time.
Despite this, the fuel rats were one of the first "guilds" formed, if you want to call them that, and have been going strong for years. According to their stats, they have rescued 157 thousand stranded players, with a 96% success rate.
I find it reassuring that in a game that is in some ways a libertarian power fantasy (you and your spaceship, go anywhere do whatever you want), and a PvP universe, one of the first things people did was create a volunteer ambulance service.