Say you've got some old Pentium III hardware sitting around, collecting dust. You could ship it off for "recycling," OR you could build an remote controlled bulldozer.
Sure, the bulldozer is just filled with a "PIII 700MHz, 512Mb SDRAM, WiFi, D-Link, SeaGate 500Gb+80Gb, and FX5200." But all the floating point processing in the world won't matter when it corners your pretty little MacBook. Soft, fleshy aluminum will give way to steel and a touch of yellow paint as the old guard returns to take its seat at the throne.