Answer:
I never was but am always to be, and everyone looks forward to me
What can you lose that will cause other people to lose theirs too?
Precious stones in a pack of cards.
What can get you there in eco style, pushed by your legs mile after mile?
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.