It's less about money and more about the mental energy required to distill such a granular view of money/value. $3 is basically the same as $10, or even $50. Even when I slept on the floor of an office building and made $10/hr I never thought like that. It is madness to me. Spend that energy thinking how to make $10 more, which is incredibly easy, far far easier than the mental energy micromanaging single dollars.
If 10$ per hour seems like a low wage for you, that explains it.
It is a low wage... it is literally $5 less than minimum wage.
And also, nothing I said literally changes at all, whether its $7, 10, or $12.
In my country, minimum wage is about 4$ per hour. And as a student, I don't get any wage at all, aside from random one-time jobs and scholarships.