My 2 cents....

The act itself is not against the ToS. I've helped someone with their homework for gil... You can do anything you want for gil....

However!

If someone you carry just purchased a million Gil from RMT the only thing the tracker is going to see is... Player A purchased Gil and Traded it to Player B... both are now suspicious.

All of your chat logs and weather or not you carried someone could easily be a convenient cover up for you to knowingly take RMT gil third party.

Can you sell help for gil?

Of course you can!

Can you become suspicious for being traded RMT gil?

Of course you can!

High rewards always come with high risk! You could just mine like the rest of us.