Because you could put your eye out with one of those things.
I have no conection with the link below, it is included as a reference to this post.
Browning BDA 380 : Semi-auto at GunBroker.com.
If I was looking for a high capacity 380 pistol I would look at one of these. A fellow LEO purchase one in 1977, It shot great and he did shoot it a lot. Most of use didn't see a need for a High Cap .380 either as an off duty gun or as a BUG that big. But he did and he was happy with it.
I have seen them listed as low as $299.00