Yeah, as everyone else has said, they're cheap, you can get them nearly everywhere (gas stations, drug stores, Walmart, wherever), they light easy, always have the perfect size flame, last for a long time, plus they're available in all rainbow colors and different sizes.

I like Zippos when lighting blunts, especially when they get down to where they're too small to hit, and you can tuck the blunt roach into the Zippo and still hit it. They're cool. They suck for bowls, though, because the lighter fluid tastes kind of shitty and it's hard to get it to light right.