You have nailed this. I have been pondering about such anonymous marketplaces and I came to similar conclusion as yours.
In a non-tourist marketplace you get lots of repeat customers and not too many inflow of new customers. So merchants are highly incentivised to provide decent quality service/product. If not then they won't get repeat customers and there aren't too many new customers to keep their business running. There's also a kind of word of mouth review. So chances of fake products and scammers is quite low.
Tourist markets on the other hand are exact opposite for reason you have already explained. And an online marketplace is essentially a tourist marketplace. There's a good reason Apple is so ruthless about Appstore moderation. They don't want it to turn into an Amazon like marketplace. The irony is Amazon's unique selling point was that they are not Ebay in that they would vouch for the quality of goods being sold there. But now in search of profit Amazon has become Ebay. And this is how every online marketplace will be I have seen way too many of them.
In a non-tourist marketplace you get lots of repeat customers and not too many inflow of new customers. So merchants are highly incentivised to provide decent quality service/product. If not then they won't get repeat customers and there aren't too many new customers to keep their business running. There's also a kind of word of mouth review. So chances of fake products and scammers is quite low.
Tourist markets on the other hand are exact opposite for reason you have already explained. And an online marketplace is essentially a tourist marketplace. There's a good reason Apple is so ruthless about Appstore moderation. They don't want it to turn into an Amazon like marketplace. The irony is Amazon's unique selling point was that they are not Ebay in that they would vouch for the quality of goods being sold there. But now in search of profit Amazon has become Ebay. And this is how every online marketplace will be I have seen way too many of them.