Didn't think you would go this low Nexon...

No scam. The event description clearly says "The chairs will be 30 day, 90 day, or permanent."
Whether people choose to buy the tickets or not, knowing this, is their own problem.
People used to gach (ordinary gach) for chairs, and get far fewer perma chairs for the same amount of dollars.

But where does it say that in the item itself? You can't expect everyone to read all the stuff they put on nexon.net