Why people choose dedicated server when shared or Reseller web hosting account can fulfill their requirement?

There may be more than one benefit of dedicated server use that might be of interest to you?

One benefit of dedicated server usage is that you will have full control of administrative functions. Obviously, this is not something that could occur on a shared server, where you would be sharing space with hundreds or maybe thousands of other web sites. Because you have the benefit of dedicated server control, you can make changes that will impact only you, not the untold masses.

Another benefit of dedicated server usage is the level of security that you control. The ability to lock and unlock the server is in your hands. No one will be able to do anything with your content without your express permission. You become much less susceptible to hijacking. Making changes to your documents can be done quickly and easily.

Another benefit of dedicated server usage is that you still have support from the web hosting company. While it is true that support will most likely be limited.