As stated I do it for a different reason per my different experiences.
A fouling shot will dirty the bore. Shoot, swipe, shoot, swipe, shoot, swipe. Your bore remains the same. A perfectly clean oiled barrel is different than a barrel that has been fired and swiped (not cleaned just swiped) and will usually print a bit different. At the range could cost ya a prise. In the woods at minofdeer conditions it wont do nothin.
Like I said I will always fire my rifle the early AM of a days hunt (1/2 a load of powder) just to assure it fires and there aint NO MO Moisture. Load and hunt all day. CLEAN WELL. Start the next day the same.
I cant tell you why here in arid AZ I have had several FTF as we dont deal with that humidity word much. I can tell you since I started firing a load every AM I have not had a FTF again so I will just keep on doing it!