"The short and sweet reason is simply this: XHTML offers no compelling advantage — to me — over HTML, but even if it did it would also offer increased complexity and uncertainty that make it unappealing to me." (via)
I share the same reasoning as to why I prefer HTML to XHTML. No need to argue it, really, it's a personal preference and I will never use the supposed advantages. I already have other tools to do those jobs with plain HTML.