In a perfect world or main street hub with continuous walk-thru it is sloppy biz practice,
but in many places some business models won't work, I've seen too many new stock bling shops go under within 6 months
and the mixed bag ones go on for decades
For some owners there is the 'variety' factor too, even if there is some apparently stale stock, they like to 'fill it up' and move it about,
whatever it takes to get the people in for a looksee, address their queries, and hopefully drum up a mutual transaction
A lot of places here mash it up with the old and new, and SALE time usually equalizes the situation, to either cull off old stock and or new dud stock
I personally don't shop where the stock is just all new, be it electronics, tools, cars etc
Most new stuff is shiny, boring breakable
designed crap, churned out of modern sweatshops
I'd rather score a 10 year old unloved working Fluke and take my chances, than cross fingers on a new overpriced chFluke
A wrecking or scrap yard would giggle at this, they embrace all stock, new, old, vintage, stone age...