Why need customers change to others even we paid for the original jerseys?

The warehouse sends out at least ten thousand pcs jerseys each day, and many jerseys sell fast, especially at hot sell season. Normally the staffs send out package at night time, please understand even there are one hundred jerseys in stock at day time, there are so many orders stand in line, so warehouse have to carry out early order first and ask the rest consumers to wait for some days or change to others.