For email marketers and email newsletter senders, the email domain will generally correspond with their website. This allows recipients to easily identify who the mail is coming from, or to easily reach the website. In other cases, recipients may be able to use a simple, straightforward email domain to reach a catch all mailbox in the case that they are unsure of their intended recipient’s email prefix.
In housing terms, VPS hosting is like renting your own apartment in a larger building. You're much more isolated than in the roommate situation mentioned above; it's still possible that a neighboring apartment could causes annoyance for you, but far less likely. In web hosting terms, Site A's traffic surge won't have nearly as much impact on Site B or Site C. As you'd expect, VPS hosting costs more than shared hosting. You'll pay roughly $20 to $60 per month.