>>If you are poor (actually poor), there are so many government grants and scholarships for low income students that it's much easier financially than if you are middle class.

Availability doesn't automatically lead to discoverability or accessibility. Most grants require a ridiculous amount of paperwork and the ability to navigate a complex bureaucracy, which poor families have neither the time nor the skill for. A lot of the parents in poor families work multiple jobs. Some barely speak English.

Reality doesnt match your expectation.

http://www.pewresearch.org/fact-tank/2014/01/15/college-enro...

And note there are more low-income people than high-income people demographically.

There may be less poor people in college, but it can be easier for poor people to pay. There is sort of this no man's land where a person (or their family) makes just too much for assistance, but not really enough to pay. My family fell into this area while in college, and I worked 20-30 hours/week on top of a normal 12-15 hour course load. To make up when I took 12 hours, I also went to both summer sessions each year. It was a long 4 years as I had maybe 3-4 weeks out of school each year, and zero time out of work.

This is a case of middle-class complaining how they dont get the same benefits than a poorer-class. It can be unfair, but secondary to the reality that being poor makes college way more difficult even with that help.

Low enrollment is not because of ability to pay tuition for low income. Many poor people don't enroll because they didn't have encouragement from family or they had other obligations (e.g. taking care of family members).