I have to say that I really like XenForo. But, part of me thinks that vBulletin will respond by releasing a really good upgraded version, which will have a CMS and all other bridges and perhaps coupled with a sale will blow XenForo out of the water. Ultimately, I would put it to you that people do not want to take risks, and stick to brand names that they know.
I appreciate that Kier is a bit of a brand name himself and that there are a lot of keen people on this forum. But surely, we are just a very small number of potential customers who will not alone be enough to make the product swim?