Yep.
Besides, patch cables are dirt cheap anyway. We pay, what, $0.42 for a 7 foot CAT6 patch cable. My cabler could probably make them just as high quality, sure...but the 3 minutes it would take him to measure, cut, strip, and crimp would cost more in the long run.
If you want to do it for shits and giggles, go ahead...I've done it...but in the end, commercially made cables are superior.