It is not about plat sinks. Krono on origins can be 1 plat if it is hard to make this amount.Never, ever going to happen. The ship has sailed on this one.
Never mind the legal issues relating to what happens if they do this (When you buy a Krono from DB the expectation is that it is for use on all DB-owned games including both EQs), but it's also going to be extremely hard to outright lock a shared non-inventory consumable.
They don't have to buy, sell, or consume the Krono on Origins to get the subscriber benefit.
And if you're referring to player-to-player exchange, look at it this way. Even if they ARE tradeable on Origins still, which is 100% likely, nobody is going to have the plat for the huge exchanges like we see on Live.
There are also many times more plat sinks in the 2005-2006 era than there were at any point in the game's history sans launch.
The problem is that this useless item, in term of the gameplay, suddenly starts impacting the actual gameplay! You get people farming stuff just for the sake of this item, skewing economy, encouraging finding exploits, bots camping names and whatever...
If no krono to be exchanged on this server, then there is a very little incentive for farmers and boters to be on this server.
It also affect "normal" players as it distracts in a way that the highest goal of the game is not anymore to enjoy the game, see everything, unlock mysteries and get the best fabled gear, but instead is to earn krono...
And when I see someone on the docks in some very good gear on a horse mount I would know, like in old times, that he earned it and that I have to do better