RC is made untradable because we have the concern someone who stocked up the rare candy will take advantage of it given the NPC no longer sells it. And the next thing you know rare candy price will be 100k each, and people will start complaining about it like they do for MS prices. :confused:
Then make RC buyable somewhere else for 20k or 15k. It was good cause it kept a wall/limit on the price of RC, so in that way it kind of had a purpose, even though it was a different one than intended. It's only logical that prices would raise slowly, because you removed the wall that was keeping it under 20k. I still dont see the problem in trading RC..