Hopefully Nexon catches this quick.

Always somethin'. Why are these items even obtainable in the game if they aren't in use for the events and such.

If they were ever used once, you can't remove them from the data on the off chance that someone still has them. It would probably break their characters due to undefined data(something I doubt they handle gracefully), I imagine.

That's one of the reasons expiring items is actually a good idea, however even then it's not handled properly to be able to remove them from the data, because the item still exists when you log on until the game realizes it has expired. I've had items sit in my inventory for hours before the game went, "Oh crap! This is old! DELETE IT DELETE IT DELETE IT!"

Edit:

Even more? T_T
Why would someone do this. I don't get it.
Is it for attention or are they trying to say something? What's the point!

Well, there's really two reasons I can think of off the top of my head.
1) They're the type of person that wants to point out how terribly flawed MapleStory is and how easy it is to break it...which is obviously very easy considering all the ridiculous hacks that have been coming out recently.
OR
2) They think it's hilarious and they want to break the game for the hell of it (IE, the video posted).