Unfortunately there are numerous reasons for commuting. One of the most unfortunate is due to the company closing the base you moved to and the lack of a relocation package that adequately compensates you for the forced move. Except for the brief period the base we moved to was open I commuted and never had a missed trip, however things have changed dramatically with the domination of the "Beagle" in our market and the ever increasing load factors, commuting sucks. As long as it is allowed pilots will commute. In my case the sacrifice in time and upgrades, had to remain senior to get commutable schedules, were worth it however if I was starting all over again in todays world I would never commute by airplane.