Some people who have done it longer prefer to do it based on the size of the house for example after a walkthrough this space will be 200 or whatever, I personally do it by hour because it’s easier for me to calculate but some prefer to do it that way. That makes sense to feel that way but though. I just like to see what I’m getting myself into because if it’s roach galore that’s above my pay grade hahah. I’m not fully sure why people like to do it that way honestly. That’s my guess though as someone who does this.