There can be 15 at a time as that is the max number of players per team. It is just that it cost 75res each. Look at my steam profile under gameplay stats, you see where it says half life: yea that is NS. http://steamcommunity.com/id/IBIS/

As should be apparent from that information logically we will be hosting servers for that game even in pre release. I ordered the special edition the day it went on presale.