Answer:
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What has keys but no locks, Space but no room, You can enter but you canβt exit.
Edible items purchased in large quantities.
It is something you make after you've weighed your options.
Sends paper without using the post office.
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.