[follower]

> being compensated in accordance with the value they're generating.

I think the above phrase is the key to understanding "per-day" vs "per-hour" billing thinking.

I suspect most developers don't think in terms of value they're generating--partly because they don't know the value they are generating.

It's easier to think that you're billing based on "how long I'm sitting in front of the computer typing" rather than "how much value I'm generating" because then you don't need to think about how much value you are generating.

From a client's point of view, they're never paying for you to sit in front of a computer, they're paying for the value you're providing to them.

I suspect part of the issue is that "per-day" still seems like a measure of time not a measure of value.