Exchanging Meso for Maple Points

Cash trade room is better (for nexon) because it doesn't introduce NX into the economy.

Neither does this. MP =/= NX.

With Cash Trade Room, not a single smega is used without someone, somewhere, having given Nexon a US$ for it.

Not a bad thing at all. Did you forget there would obviously be a limit?

With this MaplePoints-for-meso deal, people can smega without anyone ever having paid for them.

Not true.

Why would Nexon want that? Just for the meso sink? Plenty of ways to do that without giving people free cash shop items.

It isn't free. People still need NX for MTS and less meso in the market makes it harder for people to do that, making them turn to buying NX. Nexon can make any item they don't want easily bought through this not able to be bought with MP.