I don't seek out Christian geek entertainment, but I am much more willing to try to support a Christian endeavor, whatever it is.
Now, I happen to like a bunch of geek stuff, so I might gravitate toward Christian geek stuff, but I don't seek it out for that purpose.
So, if I were to speak of Christian entertainment as a general term, I definitely seek that out. I listen to a couple podcasts that aren't Christian specific, but I listen to a bunch of Christian ones. Take "Welcome to Level 7" for instance: I could listen to any of a number of podcasts about it, or Marvel, but knowing about the guys who run it, I chose them. I chose a Christian gaming group to join, and I listen to a couple Christian groups (Red and Project 86 in particular).
(and hang out on a Christian Geek forum...)
Why? Because so much of the rest of our culture is non-Christian, if not downright anti-Christ.
I am willing to debate and otherwise interact with that culture, but when I want to be entertained, I don't want to do so with my guard up all the time. Nor, do I enjoy the pokes and jabs that happen constantly. For me, entertainment, recreation if you will, is better if I can actually relax.
I know that is me, and others have a different take on it...and frankly a lot of Christian-specific entertainment is poorly done...so I am not recommending everyone take on my particular approach.