Some tools exist because they are valuable and remove market friction. Others exist because they are perceived as being valuable, even if they are actually value destroying, or only valuable in rare circumstances.
Valuable Tools of the Trade
Outside of paying for a domain name, hosting, site design, and buying a few links you could create (an ad supported) business online virtually free.
Blogs are easy to post to, easy to subscribe to, and easy to comment and interact with. Keyword tools and analytics services are easy to view and infer ideas and trends from. Searchable email saves time. Google Alerts and feed readers save time and keep you connected with your industry. Many of these tools are free, in spite of offering great value.