[TobTobXX]

Sure, it's a value calculation.

If you're able to serve delicious pizzas afterwards, it was worth wasting the first kg (you might call it an investment).

If you're able to bring value to millions of users, it was worth to invest a few GWh into training.

You might disagree on the usefulness. I think, you shouldn't have wasted a kg of flour because I won't ever eat your pizzas anyway. But many (you, your guests, ChatGPT users) might think it was worth it.