This is such an interesting thread. I haven't seen anyone else talk about my approach: I share where I'm going, and then I say "you know, I do this through my hobby, earning travel for free... I'd be happy to show you how to do it, too."
What's amazing to me is how few people ever bother to take me up on my offer. Does anyone else notice this? Maybe they think it's too difficult or something, but I keep saying "it's really easy and I can help you get started" and still no bites.