Yeah, this whole "marketplace" thing needs to die. I'm watching the
exact same thing taking place in real time with a local shopping website that has started including external sellers and "facilitating" or "fulfilling" the order for them through their marketplace. One of the main things I'm noticing is that this "marketplace", as with Amazon, is being flooded with Chinese, unbranded knockoffs with fake pictures. Each actual product * every conceivable variation/renaming of product * every seller willing to sell it = huge explosion in products. (Okay, exaggerating a bit for effect there, but true to some extent).
The marketplace thing only kinda works if you have "dedicated" or "focused" or "themed" sellers that functioning within clearly defined niches/segments. Instead, you get a seller that randomly sells 15 kitchen towels, 3 garden ceramics, 50 woodwork jigs (really only 5, 50 variations), and 1 food product. Next thing you know, I'm searching through 50 pages of "school supplies".