*Shrug*
I'm not sure I would want players to buy my game that are either too busy or too lazy to try the demo. Judging a movie by its cover is a pretty foolish thing to do. From the way you make it sound Chemical_Art, you watch the trailer and if not interested, just never look at it again.
I can't imagine making my movie choices based on something like this. Most of the time, the quality of the trailer has NOTHING to do with the quality of the movie. In many cases, it has the OPPOSITE effect. In other words, if a movie is bad, the producers spend a ton of money on the trailer in order to sell it because it lacks actual content.
The same goes with games. The Call of Duty Series may have the best commericals and trailers of all the FPS games, but I certainly wouldn't call them the best by far. There's all kinds of games that look amazing based on the trailer, but just play like crap. If a game even looks VAGUELY interesting to me, I will try the demo. Games that don't HAVE demos are typically the ones I'll avoid, because I'm wary of shelling out $30+ for something I may not even like. This happened recently with Star Drive, which had an amazing trailer and webpage, but is actually extremely crappy in my opinion, and had no demo.
So in other words, if you (the customer) won't even take an hour to try a demo for a game that looks interesting to you, that's not Arcen's fault. Nor should Arcen pander to players with such a short attention span. It's the same reason it bothers me when people add a tl;dr section at the bottom of their posts: Learn to read, or gtfo.