(David, this is not pointed directly at you, this is for anyone who thinks being an Independent Catastrophe Adjuster is the pot of gold at the end of the rainbow)
One of the biggies is the fact, which has already been mentioned, all the costs of doing business fall on you. All the costs. Hotels, food, office supplies, equipment, gas, health insurance, vehicle expenses, the list can go on and on. Not to mention that most of your waking hours are devoted to work. When you're not working in some capacity, you're not earning any money. You can consider that a minimum of 1/3 (or more) of what you earn will be devoted to expenses, and take into consideration your tax burden, its much more than that.
Anyone who deploys to an assignment spends unproductive time on the road, spends $$$ on road expenses, not to mention the wear and tear on your body. Starting off an assignment already tired and fretting about money, work and family takes its toll on people. Stress is a killer. I repeat, Stress is a killer.
If your marriage cannot withstand extended time apart, this is not for you. If your finances cannot withstand possibly months of nothing coming in and it all going out, this is not for you. If you think you're going to work "regular" work hours, this is not for you.
As an IA you won't be in the office as one might be if they were staff, or a 'desk adjuster' but there are still 'bosses' to answer to. Probably more actually, because for everyone the buck stops right at you. Since you're an IA ,the people at the office may not know you as well as they would someone who is a staff adjuster and when an insured calls and screams about how you didn't call back, or how you were rude, or some other thing they tend to call and complain about, you will certainly have to answer to that. Until they get to know you, realize you're reliable and not an unreasonable person, they will have you under scrutiny, and you will have to prove yourself.
All that's gold doesn't glitter, and the "glamor" of being on the road or the lure of being a "rich cat adjuster" just isn't the reality that some will lead you to believe. There is a lot to be said for a quiet little life with your family, a job that pays you a decent wage and being able to have a life to live that you enjoy, as opposed to being alone the bulk of the time in some strange town wondering when next you'll hold your loved ones in your arms.
Just my .02 worth