I’m not much into dyno numbers.

pittsburghracer said
The guys that don’t use their own headers, carbs, and electrical systems get me.

I have run into that before. Sometimes they just want it broke in and don't even want a dyno sheet. They just want to know that the motor is ok and not leaking oil. Not how I would do it but for them it might make sense.
Some customers don't know how to properly set timing, adjust valves or tune a carburetor so they hire someone who does. I encourage customers to watch their motor be dynoed. Some will use this as a learning opportunity but some don't care to learn they just want to enjoy the benefits well tuned motor in their car. Nothing wrong with that either.

RustyRatRod said
Dynos are great tools. I'm not arguing that. They are extremely subjective because of many factors. The end all be all is the drag strip. I'm not debating their usefulness. I'm just saying one without the other is incomplete.

Some of the motors I dyno will never see a racetrack. Most will never see a dragstrip. Most of the motors I do are for the circletrack. They are not interested in a time slip from a dragstrip but still want the motor to perform to it's full potential.