When I ask entrepreneurs and small business owners, it is not unusual for not having any marketing plan. I once read that Sir Richard Branson never had any marketing plan when he started the 1st Virgin business many years ago. In fact in one study of entrepreneurship (I couldn't recall the name of the study) was that as much as 50% of entrepreneurs and business owners don't have a business plan and marketing plan when they first started the business.
Marketing services go far beyond keyword research and website optimization. It can include everything from brand development, SEO consultation, telemarketing services, email marketing, white papers, publishing and more. A marketing plan doesn't create a path from point A to Point B; it takes a dynamic approach to identifying the influences on your demographic to then create a multi_channel marketing web that is specific to your brand, product or service.