Oh, bullshit. XP isn't a single monolithic and atomic (indivisible) entity. Microsoft has no further commercial interest in the particular combination of executable binaries, resource files, patents, and support obligations which, when combined, make up Windows XP. That doesn't mean "no... interest in XP whatsoever" at all.
Win7, Win8, WP8, and Windows RT are all based on the same kernel and user-space as XP. Presumably you agree that Microsoft can, with a "strait[sic] face", claim that those products contain "valuable intellectual property", right? Well, some of that valuable IP is also in XP. You cannot, with a straight face, reasonably claim that Microsoft has no further commercial interest in NT-based operating systems, can you?
If at some future point they completely drop Windows-as-we-know-it - the kernel, the subsystems, the shell, the libraries, the tools and utilities, etc. - then you can make that claim. Right now, they still have a lot to lose if they release that IP.
As for begging, I'm sure MS would happily sell you an XP copy if you could completely absolve them of all responsibility for it. That means not only remove their responsibility to maintain it (which, incidentally, you *can* pay them enough to do... it's just hideously expensive) but also to test compatibility and attach their reputation to its behavior. XP is substantially less secure than newer Windows versions, lacking important security features which have been standard for over five years now; if you buy XP and then get pwned, that reflects poorly on MS (especially if the news is publicized). How much are you willing to pay them to account for those kinds of risks?