Charge a monthly or annual fee to offer members access to exclusive advice or products. Sell your expertise through exclusive podcasts, offering live FAQ sessions through Skype, or forums. You may want to try selling a monthly subscription to allow users to sample new products, similar to a book club. Frequent interaction increases interest and helps build membership through word-of-mouth.
My goal with this site is really only to write about 25-30 pages with information as I learn about boats and do customizations to my boat. I’m also adding a forum. Forums seem to be very popular with boat owners so I’m anxious to have others generate content for me. I don’t have huge plans for this site, but I’m sure it will bring in a few thousand a month if I don’t fizzle out. This is going to be my fun project for the next little while.