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My guess is that the answer is something along the lines of, "Because the market will bear it." Really, it kind of makes sense... here you have a group of people who paid $3k+ for a rifle, thus implying that they're willing to spend more on this on this hobby than the folks who buy a $1500 rifle (RPR).
Good question. LRI sells RPR barrels for $575, would jump on an AI version for that price. They look similar enough that I assume the effort to chamber/thread them is the same.
You can get an AI prefit from MHSA for $550 for a Krieger tube spun by them or $575 for Bartlein by Tooley. Price includes Cerakote IIRC.
http://www.milehighshooting.com/accuracy-international/accuracy-international-rifles/barrels/