and i admit it, but reading the grey goo fence, if it stops replication after 240 events, then how could a newb rezzing the same self replicator not be stopped at the same number?
Well several(?) systems are in place to limit replication at certain speeds. No instantly generating 5000 prims for instance. More than X calls a second, or Y calls in Z seconds will disable the script. It doesn't work though, as we can see, because to be tight enough to stop grey goo from being a menace it would stop legitimate uses like holovendors and rez foo.
As far as the Fence is concerned, multiple simultaneous Goos are exactly what we have been having, notwithstanding the fact that the Goos are made up of identical objects, and otherwise indistinguishable from each other. The Fence doesn`t need tightening; it needs to be able to recognize when apparently unrelated growths are really a single coordinated attack, and that is no simple matter for a computer.