People being hacked since the last Server Check.

Did Nexon ever release a statement or (naive) an offer of compensation/improvement? Or was it a: "We don't know what you're talking about... hey! Change your passwords everyone!"?

Nexon is offering "compensation" for players that have been hacked.
The "compensation" consists of clean weapons and armors and I believe NX?...

The generally accepted answer as to why this is happening is: Nexon

Other than that, there is no concrete reason and the simple answer is nope as stated before me.
Unless the culprits actually come out, reveal who they are, show how they are doing it, and tell us exactly why, we may never know for sure.

Unless of course Nexon is doing all they can by backtracing and calling the cyber police