Valid point. But we're still early.
Will it be also valid for 100x larger community where there will be millions active users daily?
There will be much easier for bad players to hide in the crowd.
How can you tell that some seller is trustworthy before you send him sats ('make an order').
You would have to verify, digg his profile, find previous succesfull transactions, notes with reviews etc.
Same stuff which could be simplified to some score in points like on other e-commerce platform.