Like someone else said, I don't expect extra, but I do want what I paid for. If it's crooked, please either straighten it or allow enough extra where I can straighten it.
That said, I do tend to favor stores that give a smidge extra. Fabric.com gives an extra inch per yard, which is nice.
I have to roll my eyes just a
little bit when I happen to be buying all but the last few inches of a bolt, and the fabric-cutter-person either discards it or sits it aside to put in the remnant bin. I usually offer to buy it if I happen to notice before they start cutting it, but if it was me, I'd just give it to the customer as a freebie, especially if they were making a large purchase. One time I went back to the store the next day and bought the remnant ... at a marked down price.