I am in the same boat. A LA stamp does not carry much weight. Usually if a stamp is required for anything a civil is required not a LA. Yes you need a LA license to work on public projects in most states, but you can also work under the guise of a "public artist" or a "urban designer" and team up with a LA should those opportunities ever pop up. See Robert Irwin, Maya Lin, etc... If you are not doing public works I wouldn't waste your time on a license, and I certainly wouldn't give up an established business to go work for someone else.