at my go-to WM, when the amiable YV rep is working early morning, I can do up to 5 b2b transactions, 4 swipes each. When she's in a good mood (which is all the time) and asks, "would you like to do more?" I take that as cue so that I drain all GCs I have on hand. I prefer going before 7:30 am while the store is still quiet.

Reps like her is my main reason why I rarely confront anyone at WM; whenever I encounter a grumpy one, I just leave and do my shopping.