Well, I guess that answers my questions, People shoot them mostly because they're fun to shoot, and that's a good enough reason.
The same question could be asked about my favorite gauge, the 16 gauge. Once while shooting skeet I was asked why I like the 16 so much I answered that it was a beautifully patterning gun and it was lighter than the 12. He answered that he could find a beautifully patterning 12 that was just as light and the 12 was more versatile and the shells were cheaper and easier to find. I had to grudgingly admit that he was right, but I still enjoy shooting the 16.
I do have a 16 with 30" barrels that weighs a shade under 6lbs., that would be hard to duplicate in 12 gauge.
Pete