<p>1) No. At hundreds or not thousands of colleges a family income of $40,000 - $60,000 will still leave the family paying at a minimum their EFC and in most cases more than that.
2) High family incomes only mean that if a student gets accepted the family can afford the cost. Even at the most generous colleges a huge percentage - north of 50% pay full price.
3) Full tuitions covered by scholarship are rare and in many cases competitive (student applies, interviews, etc.)
4) The differences may depend on major. not all colleges and universities have all majors. Where you got your grad degree will depend on the industry - e.g. important in some not at all important in others.</p>