If you have made the comittment to go armed, then carrying an extra magazine isn't that much more bothersome,
Yeah...it is. At least for some. Including me. I carry enough junk already. I've got my Walther P99, a folding knife/multitool, cell phone, keys, wallet, surefire E2D, and OC on my keychain. And sometimes my ipod. That amount of stuff is pushing it already, and I'm considering leaving the E2D at home. I deliver pizzas though and the flashlight does come in handy. I know some people like to wear their camo hats, 5.11 shirts and pants, and have all of their "emergency" stuff hanging from their belt and stuffed into every pocket they have, but I'm not one of those people. I like to look and feel like a normal person, and not be weighed down by a bunch of tactical wizbangitry.
Reloads just seem like playing dress-up. Something to give you that feeling of "man I'm so much more awesome and bad-ass than these sheeple" while you're out at the gas station. But in reality, I don't see a reload ever being used. It's a lot of effort for little to no gain IMO.
Like others have said, the chance of you ever being in a situation where you need your weapon is highly unlikely. In addition, the chance that you will need to
fire you weapon is exponentially more unlikely. And further still, the chance that you will be in a situation where you need you weapon, and you need to fire it,
and it fails or you somehow run out of ammo is so far out there in terms of reality, it just doesn't warrant carrying around another loaded mag all the time everywhere I go.