>>1619088Large crushed small because every single shop is taking in entire product lines, and quite a few product lines will have trash in it.
The large chains with huge display areas can afford to have a bit of the stock sitting there, while the actual good products gets ordered further batches of.
But as you said, the problem is that you now have a huge warehouse where quite a bit of the display area is now crap that can and shouldn't sell. It might be the crap part of a product line, or a product line that is offered by a manifacturer to maintain a symbolic foothold in the marked, or its a copy which is subpar. Regadless, the big warehouses want to also sell those.
And because they want to sell those, if you go there and try to buy something, a salesmight either might recommend you a product that is being sold because its good, or surplus crap stock that won't survive scrutiny.
Which again feeds into the problem: Why do to a warehouse to have a salesclerk try to sell you a shit product, when you could get the same product with a discount even if you have to pay for shipping?
This isn't unique to electronics, as you have entire hardware stores for DIY dedicated to selling you power tools you might use once or twice, which means quality isn't a issue.
Or clothes
Or even food.
But the problem is far simpler: The small chains still take in the bad products, instead of blacklisting them and just offering great products.