I Park at the very back of the parking spot too, even with the rear of the neighboring cars. It does four things for you: People looking for a spot see that the spot is occupied, You avoid the swing of the front doors (and often the rear doors)of the neighboring cars, you can actually see your car while wandering the parking lot trying to remember where you parked, and the most important to me, it does not provide cover, for thieves or vandals.
I guess now I'd have to say it does five things, because you avoid destroying your radiator and AC. I'd never really considered that part before this post. I'd even avoid a curb that you "can" pull over, because a flat tire leaking down will drive that curb up into your car.