Answer:
Often wandering the streets, this group of people cannot afford to be choosers.
What grows when it eats, but dies when it drinks?
What starts with a P, ends with an E and has a million letters in it?
What goes up when the rain comes down?
A natural tattoo on babies
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.