I agree with twobit. It is a must for today's market. However, ony web hosts who know what they are doing must oversell. If they can increase the server resources and avoid its customers facing slow server performance and downtimes, then it is an acceptable thing to do.
Of course this is a hard process to do but experienced server admins can monitor the server's resources such as CPU power, internet connection speed, memory and add when needed.
Of course this is a hard process to do but experienced server admins can monitor the server's resources such as CPU power, internet connection speed, memory and add when needed.