Yet for me I'd rather buy a phone for $200 from a carrier and spend the other $400 on ammo for my other hobby. The cost per month is inconsequential to me, it's the up front cost of the device. I suppose it depends on how you look at it.
Since that was the bulk of my post, yes. It does matter how you look at it. I look past the "right now" and at the "I save $600/year." Factor in hardware and the actual length of your contract, and I save more.
My situation's math:
On Verizon:
The plan: 2 lines, Unlimited talk + text, 2 GB shared data
The damage: $157/mo
Upfront hardware: $500 (1x$300, 1x$200)
24 month cost: $4,268
On T-Mobile:
The plan: 2 lines, Unlimited talk + text, 6 GB (3 per line, no overages)
The damage: $107/mo
Upfront hardware: $900 (1x$400, 1x$500) (2xNexus 5, one from a third party)
24 month cost: $3,468
Monthly costs include taxes and fees on both carriers. Both rates also account for my work discount. T-Mobile is way faster than Verizon in my city, nearly 3 times as fast.
So, go ahead and spend that $400 on ammo. If we had the same hobby, I'd get to spend $800. Go ahead and factor in sales and "free" phones. I still save more money (~$300) than you. And I'm not even pre-paid. Saying that any recurring cost is inconsequential, especially in light of how badly they may be bilking you, exudes ignorance.
Obviously you may be on some ancient, cheap grandfathered plan and your numbers might not crunch into a savings. But for people getting new phones (and typically plans), your mentality does nothing but throw money away.