If this test excluded less than 0.1% of the immigrants, why bother? The immigrants we're taking in who will become successful will pay more than enough in taxes

If this test excluded less than 0.1% of the immigrants, why bother? The immigrants we're taking in who will become successful will pay more than enough in taxes over their lifetime to pay to the costs of those who need care. Just take them in and accept it as the cost of doing business. The ethical implications seem to outweigh the marginal gains.