I have a stupid question for all you "learned" saw guys. I watch e-bay several times a day for saws. Many times I will see a really clean saw come through with a different brand of bar on it. For example: a Stihl with Oregon bar. Of course, the seller will say the saw is in excellent shape. I always have the question in the back of my mind.......Why does it have an Oregon bar???? To me, I think the saw must have been crashed, or it was run enough to wear the bar out. Your thoughts?????