Without flaming, I would simply say that 90+% of all users interviewed on this issue (by our staff) have reported that they would wish to exploit at least ONE feature available in Windows XP Professional that is NOT available in Home edition sometime in the year following their purchase.
This puts the user in the position of potentially having to upgrade to a new OS (Home to Pro) immediately after purchase (which is spending MORE than the $50!). Additionally, there is the added labor of loading the software, installing the Gigabyte of updates and add-ins and of course "Tweaking" the OS based on the typical application uses of the consumer.
We'd rather not take these kinds of chances and simply give the user ALL of the capabilities versus restricting the capabilities by installing Home and potentially forcing the user into an upgrade scenario, which frankly is exactly what Microsoft is looking for.
It's not really a blind recommendation as you stated in your post, but rather just the opposite, an educated one. As an example, the features desired by customers are either remote desktop, Multi-Screen capabilities or the ability to restrict some system users from having administrator privileges or to hide personal files from some users. (Like hiding your personal files from your kids). Keep in mind that none of these functions are available in Windows XP Home.
There are MANY additional reasons, but again, I believe there are enough 3rd party sites out there covering the many differences between the two products and other sites simply detailing the limitations of XP Home to give any user a decent education in a short time.
If you want XP Home; great, but because it is a "limited" product, we won't endorse, recommend or sell it. I'm sure you can find thousands of OEMs and dealers that do should you desire it.
Stephen Benoit
Stable Technologies
'The way IT should be!'