Depends really, there could be many factors.
-Having to work through college to pay rent at home or other bills
-Being from a poorer background the thought of getting into 10k of debt is a little scary
-Also funding university whilst there will be more difficult than if it is paid for, you may have to work one or two jobs with long unsociable hours
-Being from a poorer background might mean you have come from a poorly educated background, therefore making it a game of catch up. I am not saying this is true for everyone but I do think it can be a factor.