I did this a couple times for limited edition systems. You just have to wait in line early and get as many as the store will let you.
It's not a tremendous amount of money but if you sell a few $300 systems for 2-3x the original price and you're a college student or such, it adds up fast.
The last time I tried doing it was for the limited edition pikachu 3DS; upon seeing a line of 50+ people in Oakland (most of which probably had the same intention as me), I decided that the gain was not worth it anymore.
It's not a tremendous amount of money but if you sell a few $300 systems for 2-3x the original price and you're a college student or such, it adds up fast.
The last time I tried doing it was for the limited edition pikachu 3DS; upon seeing a line of 50+ people in Oakland (most of which probably had the same intention as me), I decided that the gain was not worth it anymore.