However, that is probably the same subset of poor kids who currently find enough information and support to apply to the highly selective private schools.
“Meet full need” is a weaker claim than it seems. See http://talk.collegeconfidential.com/financial-aid-scholarships/1675058-meet-full-need-schools-can-vary-significantly-in-their-net-prices-p1.html .
Better for students to use the net price calculators to see what financial aid may look like. Of course, they need to take special care with situations like divorced parents (need to include all income and assets from both parents and any new spouses unless the school specifically excludes the non-custodial parent) and parental small business, real estate, self employment, etc. income (need to add back any deductions, using revenue instead of income).