Use 'be sold out' for items that are very popular and bought quickly by many people.

High Demand

Events or products with limited quantities often get sold out swiftly, implying no more chances to buy.

Limited Availability

'Be sold out' doesn't always mean forever. Stores may restock, and more tickets might become available.

Using 'be sold out' figuratively often carries a negative judgment about someone's actions.

Typically, 'be sold out' suggests acting for personal benefit over collective values or loyalty.

Being 'sold out' can destroy trust between friends or colleagues if one acts selfishly.