its very frustrating. hard work and dedication is the only way you will make it. i think that is what 'weeds' out a lot of the people who are picking up a dslr and expecting to be buissink over night. they play at it for about a year and then the novelty wears off and reality sets in - costs of insurance, advertising, supplies, etc.
I think you've hit the nail on the head. In the fall, which is my busiest time, I average four hours sleep per night seven days a week. I have to work a full time job 9 months per year and another part time job just to stay afloat. I'm also looking at replacing two camera bodies, adding a 70-200 f/2.8IS, acquiring studio equipment, and building a small (20'x30') studio on my property by the end of next year. Sometimes it seems like I'll never get out of the red.