I would be very careful following this advice. No offense, but marketing is an essential part of any business.
Even Purshine's marketing has cost him money... doing the extra work on the cars to merit a referral from his clients, the cost of going to car shows, the examples of his work he might have done for his clients or friends at no charge.
Marketing does cost money, but make sure that your money is going to the right places, that are getting you quantifiable results.
Google adwords, a website, having the right print materials (business cards, brochures, logo, etc.), other forms of advertisement such as radio, print ads, billboards, all different forms of marketing.
Will all of them work for you? That is for you to find out, or at least to contemplate whether is even worth trying or not.
Marketing is a deep, extremely important subject that most small business owners struggle with, really do your research here to find what may or may not work for YOU.