When I worked for a local quilt shop owner, we always cut an inch or so extra. I believe the idea was to give the buyer a bit for squaring up the fabric, and besides, the owner--who actually believed in ripping the fabric to get it better squared-- considered it a good will measure. I've had fabric from JoAnn's shrink- two inches or more a yard--when washed! (Once I paid for the extra-wide backing for a quilt and the piece--a bit over two yards--shrunk seven inches!)
I guess I really agree with what seems to be a majority decision: I don't expect more, but I appreciate it!