They cost so little in the grand scheme of things and take so little time. I don't know what he means about them becoming advisers. Mine have never advised me in any unnecessary capacity, and I suspect he just has experience (first or second hand) with some Saul Goodman type.
Get an experienced startup lawyer to help you incorporate at a bare minimum. Many will even defer something like your first $15k of fees (more than enough to get started) in the hopes of earning more business later when you turn into the next YouTube.