Well I do have a borescope and I get 2-3 new precision barrels per season. Most truly high quality barrels do clean up in perhaps 5-10 rounds. Others build up copper in spots, need cleaned to bare metal, then they wash with copper and are good to go. I clean when accuracy drops off, but I often times don't need to go down to bare metal. As far as having a rifle that shoots in the .1's and can go 400+ rounds without accuracy dropping off, I have never been so lucky.
BTW, where is the peer reviewed quality research you speak of? It's not on Sniper's Hide.