1, do keyword ranking, leading to a large number of customers to sell products and services. Many large machinery manufacturers is to do so, apparently SEO to earn a lot of profit.
2, bring a lot of traffic through SEO, so cooperation with the manufacturers to advertise or buy products, such as type of traffic stops.
3, do site keyword ranking, then a referral customers, such as making a sheep station, introduce clients to other farms to earn profit center.
4, do platform to earn membership fee, such as recruiting station, Marriage station.
5, do platform, fee earning businesses with a large number of users. For example, try off site.