[advertising guy]

any reason as to why ?

[JasonC]

That is obvious - they are afraid they will catch them and then have to do something about it, and they are mortally afraid of that political circumstance.

[finnigan2]

"any reason as to why ?"

- The only reason that I can fathom is that South Korea is playing a waiting game, trying to appear neutral, in the hopes that when the North Korean regime collapses (sooner rather than later, they hope) they will have maintained a closer relationship with the North and thereby be in a position to negotiate reunification.
Or, as Winston Churchill once said, their policy may be simply to feed the tiger in the hopes that it will eat them last.

[RockinRight]

Because the South Koreans are more dedicated to their ethnic brothers and sisters in the North than to freedom and capitalism. Most of them would rather reunite under Marxism than go to war with them and risk a few of their lives.