That one, I might slightly disagree.
IF you have a bundle for example, it should be available sometimes, like a sale of sorts.
If some stuff is in “probation”, meaning it is a new item, and they see it is not selling as intended, they could pull it and give space to other stuff. So in that case it is smart to make new items for a time in a “new arrivals” shelf so they test the waters. If they merit sales, they go to the permanent selection. Also a form of not overwhelming the buyer with one too many offers.
However one can see a pattern here: People often ask why they dont leave stuff there mentioning a very narrow list of items they wish they were there. That is a sign it is a “trendy item”, and making “hard to get” might be something some business do, but it is not smart in a game. We wont be paying more for an item just because it does not show. We probably would be “not buying” until it does, and complain if it does come back more expensive.
As “gamers” we are folks that in general knows how to do math in terms of prices, and we are trained by the games to watch shops, “gold per minute” and “value of time” as they are prominent figures in games.
It is not smart to a gaming company try to pull certain tactics that their own games teach us not to fall for.