I'm not getting the fast turn around either. I had a 441, 260 and 660's that I "had" for 4-7 years before they were stolen and some had never had a carb kit in them. For most of their lives they ate 100LL AV gas and Amsoil Saber oil and they were all ported, no stock saws. I had bent some hands and broken some plastic here and there, but never did I sell one due to the fact that a new one was better or started better.
I have cut with other "loggers" or for other loggers and I find its pretty much just shear abuse that kills them, requiring the shorter lifespan. I sure don't baby mine, but I don't throw them around either, and I think I can handle one in the cut pretty good so they aren't always getting the guts dawged out of them. Some people can cut trees down, but really don't have very good saw handling skills and the saw takes the brunt of the force instead of seeing it about to happen and feathering the trigger or something, who knows. I get longer life out of most anything though, where as, I know others that could damage an anvil, there is a wide range of operators in between.
Sam