The average family can save a lot of money at Costco, but you have to be smart about it. You cannot just head off into Costco with an empty stomach and a pocket full of cash, that is going to be a costly, costly mistake. For me, since it's just me an my wife, there are many things that don't make sense, but we still shop for items we can bulk up on a couple of times a year and the savings can be substantial. You can easily save enough money in 1 trip to cover the cost of the membership, very easy. Another more personal preference I shop there is the meat department. I am a true carnivore and lover of smoking/grilling/cooking outdoors. You will be hard pressed to find better quality and finer tasting meats, at any price, anywhere, period.
As for them dumping Apple products, I really could care less, I have never purchased an Apple product, and doubt I ever will.