i shoot a lot, but i really just shoot 3 guns: my social carbine, my daily carry pistol, and my match rifle.
for the first two, i would never shoot them and clean them and then just hope they worked after i just disassembled and reassembled them. for the last one, it's basically useless unless i foul the bore back in.
so when i do clean, i do so at the beginning of my trip to the range, then i shoot them, and then it goes back in the holster. i'm always going to shoot a few rounds after i clean to make sure it functions, so it's not really possible for me to have a perfectly clean gun. given that, what are we really talking about?
i reject the comparison of a fouled bore to the mold and bacteria colonies in a week old stack of empty pizza boxes in some college dorm. we aren't talking about cleaning 'dirt' out of firearms, or cleaning them because of body odor or something. we are talking about mostly inert copper and powder fouling, unlike the solvents used to remove it. it doesn't hurt it to stay in there, and for consistency in precision shooting, it actually helps a lot. it's not like if you leave a little powder fouling in the barrel and come back a month later and there will be a ton of powder fouling all over the gun.
btw, how many of you clean your car every time you use it? my guess is most people use their car about 4-6x per day and clean once / week. so 35 uses per cleaning?