government grants aren't available to everyone. trust me, most people who actually want that path have looked at every possible outcome. and that information is not as easily accessible either, if you don't have internet (which many poor people don't at home) you won't really be able to find that stuff very much. and before you say public internet sources, those aren't open all day so someone on a work schedule probably won't get to use those reliably, especially if they don't have a car.
and what bobjr said is true too. schools do not work very well with work. hell last quarter i had that problem: on tuesdays and thursdays i had hematology from 8 am to 9:30 am and then virology from 3 pm to 4:30 pm. i needed both classes for my degree and they are only offered once a year, and my work refused to give me a shift during that long break in the middle of the day. so that's pretty much two whole days wasted where i can't work. that situation is not unique to my major or school either; pretty much everyone trying to do both will run into that at least once, and if you absolutely need your work in order to live, your school will take a backseat, resulting in more time and money wasted trying to get that degree.