Dilbert points to the ceiling and says to a roofer, "The roof is leaking there. Can you fix it tomorrow?" The roofer replies, "Well, like all members of my profession, I'm unreliable. However, I could give you a quote and then never show up or return your calls." Dilbert says, "You're hired. Nobody else would even show up for the quote." The roofer says, "I depend on repeat customers."