This sort of framing is never really valid, because when we go out to pick up our lunch, we generally do not lose part of our wages (for salaried employees). We may stay in the office a little bit longer to make up for it, but then that's a completely independent decision about how much that time is worth to us, plus how much we are willing and able to pay for that time.
You might say "going home from the office 30 minutes earlier is absolutely worth $15" to me, but that has little to do with what your effective hourly wage is.
You might say "going home from the office 30 minutes earlier is absolutely worth $15" to me, but that has little to do with what your effective hourly wage is.