How many points? 20-30 in a Mens FITA, which when you are in the 1330+ range is vital, especially in high competitive situations where 1 point is a place.
I use to plt my scores and they would always jump around 20 points with a new set of arrows and stay there for about 3 months before they started degrading.
Indoors with allows an old set of X10's will cost me 6-10 points on a FITA indoor. On a Vegas indoor (outter 10) they will drop me from 299-300 20-24x down to 296-298 16-18x. That's after around 3 months of use. I replace them every 3 months.
If you gave me the choice between competsating for crap arrows and buying new ones I'll take the easy points from the new ones.
I want my arrows to go where I aim them, not where they feel like flying to.
My wife ALWAYS takes a new set of X10's to use at major tournaments (worlds, nationals etc) as the performance from a new set will always be better than an old set.