Having thought about this idea in the past, I can say that one of the difficulty lies in the fact that the market "seems" really large, when in fact, you can only address a limited portion of it. People have different tastes and goals in what they want to accomplish in a "trip", and because the market seems so vast and large, the idea tends to gravitate towards the middle ground. You might satisfy a wide array of people, but none of them will really "love" your product. So rather than daily usage, I think the problem is of segmentation first (and competition, etc following...).