[1.2.374] Monster Park?

Correction

Hurrfailcorrection.

There was no better experience than trade wins with max Rombot summons. Ever.
For reference, Rombots gave 720 exp, meaning you'd only need to kill 84 to get more than 60k exp.
Why 60k?
Well, because that would mean you got more than double the experience that you would for just winning with A rank.

That's on 1x.
Would you like me to do the math for 2x?

PvP isn't faster exp than training, and neither would it. >.> Nexon will not just up and replace the fastest training spot available with a PQ. When is the last time that happened?

One example does not proof make. The unoccurance of an event is not proof that it cannot occur.
And I can think of several times it happened... CPQ being one of them.
Ludi PQ used to be better experience than training.
Then there was Maze PQ.
Then Pirate PQ
Then Ghost Ship PQ.

Or maybe you mean to say that they've never so quickly replaced a training area?