Another good trick in the same vein is to look at things in cost per minute/use.

A nice bottle of liquor or a nice shower head might both cost $80, but you'll use the shower head every day while the bottle might last you a few occasions, depending on how much you drink and if you're sharing.

They cost the same in terms of hours worked, but the per use cost of the shower head is pennies while the liquor is dollars.