When the 22 shortage hit a few years ago me and my teenage son seen the exact thing happen at walmart with them being on the phone posting them for sale immediately.
So us both being night owls anyways would go there way early and spoil their fun buying the big bulk packs instead of them.
We'd get off work at midnight, play games on the PlayStation or watch TV, head out at 6am and be sitting there watching Netflix on my phone, when they arrived grabbing chairs from sporting goods. We'd bag the buy then head home to sleep.
They at first acted extremely annoyed that we were cutting into their business and tried to cut the line but the sporting goods manager knew what we were up to the first day after talking to us and shut that down hard. It became a fun game three times a week, over the next three weeks. They tried to one up us the second week and came in at 6:15 but we were already there, so we came in at 5 the next time and they came in at 6 and asked where they had been. We told them we was late due to stopping at the waffle house and was hoping they hadn't got there first.
The annoyance to them and lesson to my son was worth the time, and the entertainment of their frustration was well worth it.
It got to be more fun then watching TV etc just to screw them over.
We ended up giving a bunch of it away at the time or selling at cost to people with kids.