If you are a California resident and your family makes less that $70,000 per year, your tuition at a UC school, and probably a CSU school, will be covered completely by government aid, though you may still be responsible for books, housing, etc.
I know that I would not have my job without a 4 year degree, and I started well about $9 an hour. It has definitely been worth it, and I am now considering what Graduate degree I want to try for. My mom would have kicked my @$$ if I had settled for working at target after getting a 4.2 GPA in high school (AP classes are wonderful). At the minimum, she would have encouraged me get training in some sort of skilled trade so that I would have advancement potential in my field.