Ironically, sometimes calculating cost-per-use takes more brainpower than it's worth. Sometimes I get a lot of enjoyment of buying a thing that I know I will l

Ironically, sometimes calculating cost-per-use takes more brainpower than it's worth. Sometimes I get a lot of enjoyment of buying a thing that I know I will love and considering all of the alternatives. Other times, I just defer to what worked in the past.