Why not? Life is a team game. Instead of ensuring certain comforts in old age, your parents made an investment into future. This way they get a peace of mind,

Why not? Life is a team game. Instead of ensuring certain comforts in old age, your parents made an investment into future. This way they get a peace of mind, a feeling of beating their own mortality, leaving something (well, someone) behind after they are gone. It's a great deal if that's how they see things.