First, users will be few. To make them many, you need advertising. And also need to involve sellers to place their goods. So far, there are few sellers and goods, too.
Because the real platform not even started. For now just wait for the ICO to finish, I'm sure that later next year we'll see collaborations, improvements and marketing
Well, what do you understand as the real platform? The current one is "the real" platform, you can already buy and sell, and devs stated that it'st no beta but already near the final one.
I wish they will make it a little more user friendly, but yes that is already functioning with real products is sale as far as i can see