Should I buy one game at a time or buy many games at once when there’s a sale?

Whenever i see sales on like steam or ps5, i want to buy multiple games cuz they’re on sale for a good price or just really cheap. But is that good? Cuz my dad always tells me “why am i buying many games at once when technically i won’t be playing the rest right away? It just sits in my library” what do you think? Can i have some advice?
Should I buy one game at a time or buy many games at once when there’s a sale?
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