He paid $6 for the bags, so it may have been cheaper this way and/or more convenient.
If you're spending that free time with family or friends or doing something else you value significantly, then sure, there's value to that time. If you're browsing photos on Reddit or watching TV, it's probably not that valuable if you honestly evaluate it.
Anyone who has ever burnt or messed up their dinner while cooking and still ate it will attest to the power of personal time investment.