I do not recommend buying multiple domain names exclusively for deceptive
practices. Many of my sites are about SEO, but you can break ideas down to their
core and make useful sites in less competitive markets.
For example, one site I own is Search-Marketing.info. This site is similar to the
contents of this e-book, although the site is somewhat dated. That site is not a
well-branded name. I had many concepts on that site that later were extracted and
made into their own sites: