I'll bet $1000 the same would apply to tech.
Most people have no idea what they are worth - which usually means undervaluing themselves, but just as bad, overvaluing.
Having someone who is objective and understands business just look out for you a little bit is probably worth 5% of your income. You'd earn more than that in the end. Esp if they had easy access to lawyers, or could mostly speak the language, etc.