It isn't so much the "early pulling" that bothers me so much as it is the unsportsmanlike behavior of those who do things like that. And it leaves a sour taste in everyone's mouth.

Before SE changed how hunt targets (and FATE bosses) behaved, there used to be this LS on my main's server that would grief people who showed up at a hunt. If they didn't make it to the hunt mark before everyone else did, they would intentionally take hate off of the target, pulled it until it leashed, thus rendering all of the previous participants efforts null and void. The LS is technically still around, having died down after mob behavior was changed, but it's been rebuilt several times from the ground up, and isn't as full of these douchenozzles as it used to.