Originally Posted by asgelle

Maybe because some of us are experienced at examining data with a critical eye and can differentiate between what is meaningful and what is not. For example given the lack of coupling between frame and rider, adding a rider only adds noise to the system and makes it harder to elucidate the difference between frames. As to repeating runs on different days, unless you believe the phase of the Moon or the gravitational pull of the Sun affects the results, I see no benefit to this.