Then, by your own words, Xsyon isn't a sandbox. There's nothing scarce in Xsyon.
There are sandbox games that don't have any combat at all, there are sandbox games that do not have any PvP. Never assume that the recent wargames like Darkfall or MO are in any way typical sandbox games cause they're not - they're practically wargames with a persistent world and a tiny amount of sand thrown in.