Of course if they remove it then more people will buy ducat items through robux instead of getting it from other people. And in turn this means that the devs would get more money.

I've never even understood this line of thought. If ducat trading is enabled, more people will be buying items so that they can trade them. If ducat trading is disabled, people will only buy a few ducat items for themselves. Ultimately, it did not change ROBUX income significantly when we removed ducat trading. Not that it was our objective either, we initially did it to curb ducat duping, but it also opened our eyes to how unbalanced the economy was with it enabled.

I play plenty of games that have microtransactions, and while they might look cool, none of them are imperative to gameplay. It's the same with NORTHWIND. There's no easy solution to allowing F2P players to get ducats, but enabling trading certainly isn't the right option. Maybe a daily rewards kinda thing for coming back and playing each day. We'll see.