The same reason that those of us who go to manual transmission cars never go back....more control, closer to the action. Cartridge guns, unless you reload, have little of the control and mystique.

Plus, MLing feels a lot more like playing with explosives. Big cool factor.

My addiction started with the ML pistol I built in junior high. Pretty ingenious looking back...and also lucky my right arm is still attached at the shoulder (I was using smokeless!!!! Survival of the luckiest I guess)