iamkris: I like all the answers from our "regulars." The standard match Rapid Fire event is not going to cause accellerated wear on your barrel. Your buddy probably is just like me if he shoots NTIT (Rattle Battle). I have two guns I use for standard matches and then I have an NTIT gun. I usually rotate my oldest barrel to the NTIT gun before it starts getting flyers at 600.
I am positive that an NTIT (Rattle Battle) barrel will see a lot of wear. We push pretty hot loads and we will have 3-4 practice runs at a time before a break. That is 30 rounds in 50 seconds, 3-4 times in about 6-8 minutes total. You can definitely feel the heat in the barrel.
I would not use my normal match barrels for NTIT because it is abusive. I wouldn't say that any good match barrel is a prima donna, as they only get better the higher-end they are, but they are certainly not going to put up with abuse.
Here's the most important part I think: If you cannot RELIABLY CALL a bad shot or RECOGNIZE a flyer at 600 yards then all the throat erosion in the world doesn't matter. I can call a bad shot there and I can recognize a flyer, I care about my good barrels being treated well, but if I were a blaster and couldn't tell the difference anyway and was happy if all the bullets hit the paper at 600 yards, then I would have a different opinion.
My latest match rifle sticker: "It's not your rifle, you SUCK!" MANY more "bad" shots are blamed on poor equipment than should be. The culprit is more than likely bad shooting.
To the original poster and the M14 folks: Yes, the M14 is arguably a better hunting rifle for anything larger than 100 lbs to about elk size. Regardless, if one wants to really learn how to handle either, I personally believe that learning to do very well on the AR and then transitioning to the M14 is much easier. Not only does the high-end AR make a better match platform, but it also serves as an excellent trainer for the high-end M14 as it will teach all the fundamentals much better and will keep your ammo costs to a minimum.
Once you have lerned how to handle an AR REALLY WELL, you can pick up just about any .30-06 or smaller and perform quite well with it.