I've owned both, but not at the same time. I bought my 2008 the day after I sold my 2006.
Other than the aforementioned weather protection, the C14 is better in every way. It's a twenty year newer design with twenty year newer technology.
I think the average C10 owner is probably older, and has owned the bike for a long time. They really like their C10's, and don't find any need or desire to even try something different, as the C10 suits them and their needs just fine. They are comfortable with their bikes, and may be uncomfortable with the new fangled technology and features that the C14 has. ECU controlled fuel injection isn't needed, carbs work just fine, thank you. KIPASS? An un-needed complication.
My guess is that the average C14 owner has a higher disposable income, and is less interested in saving every penny. The C10 owner isn't as interested in performance, they are just happy to get to where they are going at a nice, moderate pace. The C14 owner likely rates the bikes performance as one of it's best qualities.
Nothing wrong with either outlook on their bikes, they are just somewhat different.
At least that is my take on it!