Imagine a popular website attracting a lot of customers 24 into 7. The only way to keep your services up and running is by availing a dedicated line service i.e. a dedicated server. The issue with a shared server is that your resources-CPU Utilization, Processor Power, RAM-pay divided attention to the various websites residing on it.
Cheap dedicated server hosting is creating a boom in the market offering a wide range of services to customers at a cheaper price than before, hence attracting more and more customers.