Now now, that's not true at all. I love having the box from a collectors point of view. To me, the box completes the set. Without it, the set just isn't complete to me, which is why I always like to get the box if possible. And I'm certainly not going to go sell the set one eBay! No, I just feel that having the box makes the set complete. I guess it's just a collectors thing. Think of Matchbox cars; when they have the box, they are worth at least 10 times the price. It's nice to know that you own the complete set to, and not just the pieces. Anyone can get the pieces together for a set, but having the box is, to me, a necessity if you want to complete the set. It's kind of the same as that discussion about owning MISB sets.
Besides,the boxes have some cool stuff to look at on them.