Why on earth not? Because of the name and the selling price? This has been a point I've made before - an MS250 is built almost exactly the same as a plastic Poulan, using the same materials and construction. They each have minor pluses and minuses, but there is little difference. I've had an MS250 and my 42cc Craftsman and they are pretty much the same. The MS250 has 3cc more displacement, an inboard clutch and 0.325 chain vs. LoPro. If you compare the MS250 to a new PP4218AV they are even more similar, as the PP4218AV has an inboard clutch and a chain brake with two mounting points. The Poulans are also strato and have a better bar stud design, and carbs with all the adjuster screws. I can't imagine why anyone would buy an MS250 over a PP5020AV.
But people buy based on brand name and perceived value derived from selling price, rather than looking at actual content. This is a consequence of our non-stop marketing and advertising culture, and of a lot of people having a lot extra disposable income. I saw the receipt in the bag for my Dad's MS250C, and he paid $409 for the thing because he wanted a "good" saw. What he got for that is almost identical to what you'd get in a Poulan for a lot less. On top of that it was defective and the dealer (who clearly overcharged him) did not fix what was a minor problem and told him some stupid story about having sent it back to the factory to be fixed. So I don't buy that the quality is higher or that's it's a better "value" either. It's a plastic clamsell homeowner saw that happens to say "Stihl" on it.
People thought you shouldn't compare a BMW, Mercedes or Audi to a Toyota either. And then Lexus ate their lunch, because in fact there was not enough content there to justify the price difference. In this case the cheap saws from both brands are actually US made, and in my experience they're very effective tools, but people never tire of trashing them.