Wow, I can't believe they are that careless, and then rude about it. My LQS is so different. I've never had them be anything but extremely helpful, they make reasonably generous cuts, and several times she has caught small mistakes (like precut strips that were 2 1/4" and not 2 and 1/2", so she just gave them to me for free.)
It's just habit for me to watch as my fabric is being cut, however, since it can get confusing when you load them up with a stack of four or five bolts and have different yardage requests for each.