i like this analogy
customer "i have a problem with my water heater."
plumber "i charge $95/hr with a one hour minimum"
customer "ok i need my water heater fixed"
Plumber comes by looks it over for 5 mins and hit's the pipe and it starts working
plumber say's "i'll send you a bill for $95"
customer "but you only just hit a pipe and took you 5 mins!!??!"
plumber "that's right i have the skill and knowledge to get you up in running in 5 mins cause i know where to tap, if it was so easy wouldn't we all have a world of plumbers"
and ya there's always drama here...lol