Yeah I have no plans on alt-vaulting if I can avoid it, but maybe that will change when I get some worthwhile things to protect. It feels dishonest to me, considering the entire point of the game is to build a defensible place to store your belongings.
My guess, from the short time I've been here, is that there is essentially an upper limit on how well you can defend your land, but no upper limit on how easily you can pillage. If that were fixed, maybe more people would stash their belongings properly, rather than alt-vaulting.