Stop being obtuse. I never said it was impossible to buy a Windows 7 computer. I said it's becoming harder and harder to buy one. If you just walked into a Best Buy and had a look around, you'd know exactly what I'm talking about. However, I suspect you know that already.
These days, if I'm going to recommend spending a chunk of cash on a Windows computer, I'm also going to recommend checking it out in person whenever possible. With Macs, you generally have an idea what the machine is all about just by reading the specs. There are a very limited set of models available, and the main features don't actually vary much. But even then, people get burned. I always tell people who haven't bought a MacBook Air before to go and compare a MacBook Pro beside it. Then they realize that the MacBook Air's screen is crap in comparison. On the Windows side, it's a total crapshoot. There are a bazillion different models available, that just going by paper specs is probably a bad idea, unless you're just going for lowest cost.
And if you're actually going to try test-drive a computer in advance before purchase, it's becoming harder and harder to do so if you want Windows 7.