Because plinkers still like it, it looks cool.  

My son has one and it was great for the range when he started out.  Set distance, so the high sights weren't much of a problem.  Main reason I got it for him was it brings the weight back on the gun.  He didn't have the strength to hold a standard configuration rifle up while standing for very long.  Too much weight on his left arm.

The trigger sucks, but can be improved at home.

As far as BM still selling it.... Well, last I looked they still sold USA mags...  I'd pull that from the line before the Muzzelite stock.

Ironwood Designs makes one that looks awesome.  The price kind of scares me though.

Ironwood Designs