If you're reading this article, you might be interested in getting a dedicated server, or simply learning more about dedicated hosting services.
First of all, please note, that a dedicated server is rather expensive service, and you shouldn't waste your money if you don't plan to use it in full measure.
But if you really have a serious website, and want to run a successful business - you cannot do it without a dedicated server.
Of course it's just mere words, so let's enumerate the facts!
Freedom and security
Dedicated server will give you a freedom. You will not need to share it with other websites. It will also give you additional 3rd party security for your site and emails. A dedicated server will allow you deep access to your server to configure and optimize your server anyway you need.
You're able to choose the software to install.
Power and functionality
With a dedicated server you get on average 1TB Disk Space, plus about 5TB Bandwidth. You may customize the configuration and choose any CPU, RAM, or whatever you need. A dedicated server reduces your dependency on the web host; and bypasses time delays and possible expenses incurred from these.
Respectability
You simply CAN NOT run a popular website on a shared hosting. It's not serious.
Summary
If your website turned into a popular and reliable resource; if you have tons of daily visitors; if you work B2B; if you need additional security and functionality, power and freedom - go ahead and buy a dedicated server. Don't be sorry about the money you spent! Think about the future!