Our servers include several hundred websites, and so many users share the same resources, including disk space, processor (CPU), and bandwidth limits (the speed and capacity of the Internet connection). If one website becomes extraordinarily popular it can threaten access to the web servers resources, which it shares with other sites, and so may be temporarily taken offline.
If your website becomes very popular (such as having tens of thousands of simultaneous users) you may wish to consider a more dedicated hosting solution, many companies provide rental of such a server for around a couple of hundred dollars, or more depending on the level of service.
Be aware though, that because of our shared server model, we are able to offer unsurpassed prices and support, that will not be found easily and cheaply elsewhere.