I believe the vn have created working hack for unlimited tokens. It's been done to other games for decades it's not surprising to see the vn hacked this game...

As hacking a game is pointless unless you can profit from it (almost unworkable for rmt on in-game items), I fear it was a result of the direct transfer system that made this possible.

If there are cheap token from vn, it is because the hackers created them out of thin air.