There's also the power cost, depending on how much you're running that... went from an 8350 to an i7-4790K early last year, the power cost difference is pretty significant.
It gets you to do the math.
The $100 estimate was based on a scenario where the AMD product ran 100W hotter and ran all year long with a heavy workload.
In reality, the comparable offer from Intel runs only 10W hotter, and a normal workload, at best, only costs some cents per year.
After all those years saving money going with the best and cheaper offering from AMD, the money you save gets you more cash to upgrade your computer.
Because economic matter.