haha no we're NOT going to sell any Upgrade at ISEN never ever.
The reason why we're allowing players to trade crones at ISEN is they already can do that with little effort like crone pouches.
So as players are trading crones already, there is no reason to restrict crone trading.
But as its server concept, we're keep creating something as more closed to "Play to win" and No Upgrade / Epic at ISEN in the future.