It doesn't look right though to buyers (as the thread shows), and it's a long-standing issue with eBay. Wouldn't it be about time they implemented a way for sellers to keep listings but flag some as "out of stock" or temporarily unavailable, so sellers don't have to go through hoops? Jeesh. How hard is it. Or is annoying both buyers and sellers a sport? Maybe? 
You can actually do that!
My dad sells stuff there pretty often, we initially set the stock and as they get sold it eventually shows 0 left, but I think the item gets off the search results...
Another damned trick they do, adding several articles, where the one you want costs $50, but also put a $0.10 plastic washer!
Then: "Expensive board: $0.10!" It drives me nuts, makes searching so much harder!
It feels like walking naked in the jungle (I mean, a f** dangerous jungle where everything wans to eat or hurt you), trying to avoid everything!