Simply sharing your location has simply become a way of sending out a generic query, and local businesses have some tremendous new opportunities as a result. Potential customers sharing their locations means businesses can provide a real-time call-to-action to get them inside their establishment while they’re nearby.
http://www.webpronews.com/topnews/2010/02/24/why-even-local-search-is-becoming-more-real-time
The main reason people like the concept of forming an SEO Monopoly is leverage. Traditional SEO is like putting all of your eggs into one basket. An SEO Monopoly is equivalent to owning multiple baskets. The odds of a the searcher finding out about your company or service are much greater if you are running an SEO Monopoly.