Arnold what size pin are you using, and what AAS are you usually shooting there?
1" 25g I'v pinned a lot of stuff in there, sust, prop, test-e, deca, tren-a, winny, eq.
I dont like the idea about shooting the pecs, way too close to vital organs. Really see no reason to shoot here, would not recomend it for anybody.
Close to the organs, how so? Yes, closer to an organ then say if you pinned your glutes, but it's not really a big deal. If you pin your left pec, then yes, your heart is under there, but it is a long, long way off from where you are pinning. Assuming you have any kind of muscle mass, the needle would have to penetrate both the muscle as well as the breast plate before it ever reached the heart. If you're using a 1" pin, then there is no way it is going to go through enough to ever cause a problem. If it still bothers you, then pin the right pec.
As far as to why I pin my pecs, 2 reasons, one is out of convenience, very easy spot, and 2nd, is it simply provides another spot to pin. I've run cycles where I'm pinning every day, and I've even run some where I'm pinning 2x per day, and when that is the case you really need to find new spots to pin.