If the whole point of starting your own business is because you want to get out of the ‘rat race’, doesn’t it need to at least pay your bills? Otherwise, you are still in the rat race, just with even less time.

Not replace, but it should free enough time to run it. There's a minimum scale for something to actually free some time.

> suppose you've grown big enough to pay the bills. Does the business still need to scale?

No, that's the acceptable size.