Honestly, how is this allowed?

[Jojoya]

Oh no, he's back to torture us with the same arguments he was using a year ago.

My advice is do not engage. You're not going to get anywhere. He's set in his beliefs.

Two days ago I saw a person buying a 1 Gil worth item for 50.000.000 Gil. Some RMT trades are really obvious.

I'm guessing you don't have alts or friends. That's a very common way to trade large amounts of gil between characters on the same account, or to a friend without having to do 50 individual 1 million gil trades. It's even possible to bypass both seller and buyer market taxes if it's done via a Mannequin.

That's why it's better for SE to trace where RMT gil goes instead of running a report of large value gil transactions. Most of the large transactions are perfectly innocent. 50 million gil isn't that large an amount anymore.