Another Painless wiring question

I love to see the prices on these Painless wiring kits to! LOL I mean really aren't these a bunch of colored wires all going to a generic fuse box? Myself I brought a roll of wire and ran one wire from the electric fans all the way to the switch. I ran a wire from the electric water pump to its which. I ran a wire from the fuel pump to a switch LOL and so on...
I just never could understand how someone could pay hundreds of dollars for a bunch of wires cut to length with their own colors? And still have to do all the wiring anyways???