Firstly the safety net it provides.

Then it all comes down to how much you are taxed back and the threshold. Most high earners wouldn’t notice it. And they would have had the payment until they started earning high.

You or your partner could stay at home with the children, your kids would get money, you can get sick without worrying about money, it helps everyone.

High earners already pay higher taxes.

If your argument against it is “what about selfish rich people” then I would say fuck em.