Are you saying that it's harder to hit by accident if it is big? That's kinda counter-intuitive, innit? It could conceivably have been someone trying to fend off a pirate, and maybe a stray cannon shot or swarmer grazed your hulking death machine. If I were in that situation I'd be pretty miffed.
"Yeah sure, but first let me try and ruin this guy's day." From that perspective you'd be the d-bag for putting something near spawn that essentially locks others out of the server. If that were me and I've got nothing to lose I might just spend an hour or two trying to get back at you.