Put a value on your time. (Your hourly wage at work is a good place to start, and then add some to account for your personal time.)
Subtract a percentage of your worth to account for frustration, just as taxes are frustratingly taken out of a real paycheck. In this case, consider your personality and how you will be taxed on Black Friday by stresses like waking up at 3 a.m., parking, long lines, unhelpful associates, aggressive shoppers, screaming children, etc…
Divide your overall hourly worth (wage + personal - frustration) by 60 so you know what you’re worth every single, tedious, ticking minute!
Calculate the overall amount of money you saved (or would save) on all items by subtracting their Black Friday price from their regular price.
Add up the minutes you spent fighting the Black Friday crowds… 3 hours in line before the store opened, 20 minutes at this check out, 35 minutes at that check out, driving in circle to find a parking spot for 15 minutes… etc…
Multiply the results of Step Five by the results of Step Three.
Compare the results of Step Four and Step Six.
Did you at least break even? :)