They usually reach out to me or are referred to me via a friend. One time I had a friend doing some work for Vodafone Australia, and he just asked me to come out for a month long engagement to help them get ready for the iPhone 5 (which turned out to be the 4s iirc). Another time I co-founded a Meetup group in a relatively new technology and a startup wanted to leverage that so they wanted some help getting started and having some good patterns to follow.

So I guess I would counter what you said with experience/network rather than a brand.