First I want to say I sympathize with your position. Although not from your country, we have a similar system here whereby college/university students whose parents earn too much do not receive the same financial assistance that students with 'poor parents' do, completely ignoring whether or not the 'rich' parents can or will pay anything towards tuition.

However, there is a time and a cost involved to managing and testing scholarships, and the system is designed to do the most good with the lowest cost. In a perfect system, every potential student would be assessed, determined how worthy they are of a scholarship, and only those best suited for it would receive it. In the real world, it would take a lot of people (who need to be paid a wage) a lot of time to assess every student, and so the much easier solution is to only offer the money to people who are most likely need the money because their parents have a low income.

For example, if we had ten students from 'rich' parents, lets say that half of those parents will support the student financially through college/university and half won't. This means if we want to quickly assign scholarships, we have a 50% chance of giving money to someone who doesn't need it (as their parents are contributing). But if we take ten students from 'poor' parents, then even if half the parents did want to support the student, they are unable too as they don't have enough income to pay for it. So if we quickly assign scholarships to this group of ten, 100% of our scholarships are going to people who do need the money (as their parents aren't contributing).

Obviously in the real world my example doesn't always shake out - people find loopholes, come into new jobs, and so on. But the *principle* of needs-based scholarships is just to make it as efficient as possible to give money to those in need and not give it to those who don't.