Video server - max viewers
When you broadcasts your videos online, the aim is to reach as many viewers at the same time. Therefore, it is important to remember that there is a limit of the amount of viewers that can watch simultaneously, while the video is broadcast.
If you are limited to certain amount of simultaneously viewers, you can not broadcast to more of that amount, unless one of the viewers stopped watching and made room for the next viewer in line, so this is the second most important feature when buying / renting video servers.
Also, It can be upgraded at any stage with additional fee, quickly and without server downtime.