Why are AN bolts so expensive?

I used to be a machine operator and honest to goodness I read the following on the bottom of a blueprint once

"Revision A: print changed to match parts in stock"
It is a regular occurrence around here were we are requested to change print tolerances/dimensions to match the PPAP (production part approval process) results from the vendor. Essentially, they made an initial batch of new parts, measured them, and now want us to change the requirement to match what they made. And it pisses me off that we agree to do it nine times out of ten so that we can just turn the spigot on sooner and make the schedule.