I'm not saying I like it, but I see a difference between exploiting a loophole dishonestly versus paying for something in order to access perks, even if not using the whole product one paid for.
The two situations are not exactly the same. Paying for a campsite but not staying there may impact others, but it's different than booking a room to access perks and then flat out not paying for the room.
Booking a campsite entitles one to a camping spot + whatever perks come with it. Just as one doesn't have to use perks such as early entry, nor are they required to actually sleep there.
I get that it would be taking away a cheap accommodation from someone who might require it in order to be able to afford to visit WDW, and the morality of that can be debated, but I don't see it as a black & white, right versus wrong scenario.
What if someone books a hotel stay but ends up somewhere else one night, because they made a new friend, *wink* *wink*, or something. I don't think it's Disney's place to check in on their guests and evict them from something they paid for.