Answer:
What can touch someone once and last them a life time?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
The sharp slim blade, that cuts the wind.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
I am rarely touched but often held. If you are smart you'll use me well. What am I?