I believe that is a truly legitimate reason..distance factors and time and cost involved in getting there. There are lot of 'not so legitimate' ones that I know of - my boss says very often if you want a 9 to 5 job with no extra time for learning or updating your skills then technology is a very wrong choice. I understand truly that people's choices may be complex than that - but as Andy said to stay 'employable' and competitive one has to make some sacrifies, time is one of them especially in this field.