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If you're saying you'd put some (not all), of your most profitable product pages directly below the root domain (in the first folder) then I can see how that would work. But if you're talking about putting all 50,000 product pages directly below the root, no. That would distribute your link juice too broadly and confuse visitors and search engines. Seems to me (and I could certainly be wrong), only big, established and recognized brands go the route you're suggesting.