Well... As a Full-Stack Developer; we fall into two camps.

1) We work for Companies that will never need you to come in and consult because any Full-Stack Developer worth his salt understand Design and Coding AKA. "full-Stack" providing the same expertise you sell.

2) we are Consultants/Founders that are self-sufficient working on our own businesses and/or making a living catering to the same companies you work with.