I've read a popular ebook that teaches the reader to make money online. The method involves making lots of websites composed of 5 pages max. Each website would target a specific niche and would sell a specific product or groups of products related to that niche. If course, the disadvantage of this is that you would have more domain costs.
You may also opt to maintain one authority website. Focus on this website and create lots on content for this one website instead of making lots of websites with just a few pages.
I personally prefer to have lots of websites with few pages than one website with lots of pages. I believe that it's easier to market different websites than just one website. What are your thoughts?