My Answer: I have worked in many industries so my answer might probably be yes. However if you are in the gambling or adult industry, these are a NO from me. I believe all industries require SEO as there is a lot of competition in every niche.
Why is this question important? This question will let you know if the SEO consultant has experience in your business niche. Your partnership is up to you. You will have to determine whether they are a good option for you or not. Experience is a needed characteristic to ensure perfect SEO strategy implementation.