Phillip, great question.
We can only buy our saws a couple of handfuls at a time. 6 or 7 years ago, we only had 440s with a few 460s. Some of our saw work (thinning, brushing, and the like) called for smaller saws so we picked up some 361s, which still have quite a few interchangeable parts and performed well for a lot of years. The 440s went off of the market (the first time) and our suspicious shop owner sold us some 441s to try out. We had miserable luck with that first round of 441s -- maybe we got some lemons, maybe they got mistreated, not sure -- so when faced with the prospect of buying 441s and 362s (while we haven't owned any of them, we've worked on them a little bit during a saw training here and there, and they were dreadful little things), we switched over to the Huskies.
If we were able to drop 40 or 50 grand at once and wind up with four or five sets of similar saws, we'd certainly do that, but it's somewhere between 6 and 12 we can pick up in a given year and the models keep changing on us. We could surely stand to have a little more flexibility in purchasing, but, you know, might as well pass the buck on over to the EPA.