The distance isn't that big an issue, although weekday practices would be tough, since my wife and I both work until 5ish. She played for a team last year that was based about 2 hours and 15 minutes from home, but they usually practiced on weekends, and didn't expect my DD to be at the few weekday practices they had. Some teams wouldn't be the same though, I'm sure.
We've built a decent team this summer from girls in about a 30-mile radius from us, and I think some of the girls have some good potential, and while I'm obviously more concerned about my own DD's development, I also would like to help the other girls have opportunities to move onward with softball after High School if they want to. I'm not saying I am the greatest coach or anything, but I am trying to learn all the time (which is why I'm on sites like this one and others), not just on the field stuff, but also the other stuff the girls need to know, like sending letters to colleges now, not when they're a senior, etc., and if I go a different path next year, I'm not sure there will be anyone to take my place, especially in the off the field stuff.
But hey, every good travel coach started out as a rookie sometime in the past, right? If I expect my girls to work hard over the winter to improve, then it's only fair that I do the same. Besides, I have a 3 year old DD too, who will just about be ready to start 10U when my older DD hits her college years, so I won't be quite as inexperienced that time around, if the little one loves softball as much as her older sister.
Another idea to consider, while not optimal, is to hold seperate parctices during the week. We had an asst. coach that lived near 3 or 4 of the players and I was closer to the other 8 or 9 and he and I would communicate what we were going to work on that week and he and I would focus the weekday practices with that in mind, then when we met for team practices on the weekends everyone was at least familiar with the lesson.