Sarcasm is designed to identify fellow members of your own group (identifiable by "getting the joke" and laughing at it). Identifying and grouping with your own kind is a very handy skill, which makes sarcasm a very common response.
I'd use some care in how you use it though. Using such obscure sarcasm that members of your own group don't even get the joke results in separating you from your group rather than uniting you with your group. For example, if you respond to a flight attendant's statement, "We'll be landing in Chicago momentarily", with mock fear, "Will we have time to get off!??", 98.7% (of the 23 people on the plane with you) will think you're an idiot. Somewhere in the back of the head of the 23rd person, the realization that you're referring to the flight attendant's misuse of 'momentarily' is beginning to sink in, but he'll be sitting on his next plane before he laughs, which does you absolutely no good.
If you're going to use sarcasm as a recruiting tool, you need to use even more care. The sarcasm has to be an invitation to membership in your group, which means it has to be understandable even to non-members. It also has to be enjoyable enough that the prospective new member will join your group just for the opportunity to use such a prime sarcastic comment themselves. There's a few of those, comments so choice that you'd be tempted to become a devil worshipper just to use that comment in a conversation, but not many, so you face a tough challenge if you're using sarcasm as a recruiting tool.
Also refrain from the common mistake many teenagers make when first learning to use sarcasm. Don't roll your eyes unless there's actually a member of your group present. Communicating with imaginary friends just annoys people, especially if they don't have as many as you do. It just rubs in how unpopular they are and makes them want to go sulk rather join your group.
Edit: Also, never use sarcasm that might backfire on you. Dick Cavett's comment, "Are we boring you, Mr Rodale?" lost a lot of its effectiveness when it was discovered that Jerome Irving Rodale, a pioneer of organic farming, had died right there on Dick Cavett's stage. The obvious answer was, "Yes. In fact, you bored poor Mr. Rodale to death, Mr. Cavett." (off topic, but a funny moment in TV history).