When GT first hit the market, their sales REp showed at a shoot.
We discussed this. He told me that 90% of the "runout" (difference in straightness) was on the ends.
He said if one was dilgent, bought the cheaper ones, cut half of what you want taken off a shaft from EACH end, and you loose much of the difference in straightness between the two for a lot less money.
I've done that for years!
If you need arrows longer than 29.5", the effect might be mooted a bit, but I share that ditty for what it's worth!