There are some of us with such specialized talent that finding yet alone employing us is next to impossible. For example one of my firms big specialties is per

There are some of us with such specialized talent that finding yet alone employing us is next to impossible. For example one of my firms big specialties is persons with disabilities development and consultancy for web applications. Put simply, we make JavaScript web apps work for the disabled. So along with our general UX/HCI development services, we have people that specialize in PWD/UX. To hire one of them would be ridiculously expensive, there are maybe 50-100 people in the world with a formal HCI/PWD education, and you would only need them on a project for 1 or 2 months max, usually less than that. So unless you are doing a lot of different projects it makes no sense to hire that role. Security is another that you generally don't need a full time loaded person for.