Traffic is a must if any online business is to succeed. Your business can either pay for that traffic through advertising, ezines and other means... Or you can decide to go the SEO route and get all your traffic for free.

However in doing so there is first an outlay in costs to get your website highly ranked on all the major search engines. The more ranking you would like to obtain, on multiple pages, using multiple keywords/phrases, the more costly it will be to your business.