Mark, I do think that you are correct that running a lot of small stuff can eventually produce "wear zones" because we tend to do them in the same position on the machine for speed and convenience. I even set memorized center points for X-Y for these kind of jobs. But I'm also paying more attention to lubrication...I learned that awhile back when I was starting to get some funny noise while running the chair seats for Brian and fortunately, it was just a need for grease.
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In other news, I picked up a nice stick of lacewood this morning to run a few of the larger boxes with and wow...beautiful result. (Photos will come once they are finished and flocked)
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The most expensive tool is the one you buy "cheaply" and often...