The biggest problem I see is that retailers generally don’t want to increase visibility for their competition. Competition usually lowers prices, good for consumers, but business is not a fan. Even in non competing markets, consumers only have a limited amount of money. That $50 you spent on clothes is $50 not spent on power tools. The main reason some sell on markets like eBay/amazon/etc is because they’re so large and centralized that you can’t really avoid them.