They are not. But how ungrateful are you if you don’t recognise the fact that your parents not only invested money, but also sacrificed time and effort in moulding who you are today. OP has a stable job, $170k net worth, but gives his parents $6/day while living rent free.

To each it’s own, but that’s just morally unacceptable to me. How long more will your parents have left? Do something that makes them happy lah - be it allowance so they no longer have to work so hard, fancy meals every month/fortnight, gifts etc.