There's no promise of a reward for being appreciative. We give thanks because we are thankful. There's no other reason to do it. When I hold up my bowl of oatmeal in the morning, it's because I am thankful to have food, not because I'm praying for a steak dinner later that day. What I understand is that life, my life, has enormous value, as does yours. Even if it is a one-time trip, it's worth the journey.