I grabbed all I could carry and brought it to the front.
Are you hoarding things?
No. I just think of this as a new opportunity.
While it's yours if you buy it, you need to be considerate if others need that stuff too. You should ask someone if they need what you're stocking up on, because it's good to share.
What does it matter if I don't share?
How would you feel if the person there before you bought everything and there was nothing left for you. Don't you think you could ask the manager if they have more stock to make sure that they can replenish the shelves?