What's my motivation?, Money or Karma? Both? Neither? Options

[eidolon]

These questions were posed by Talia Invierno in the Edge, SR4 Luck vs SR3 experience thread. I'm throwing them up here for discussion because I think they're interesting enough on their own.

What does money represent to the runners you see?

and

Would your group still play if you took away karma improvement entirely? and left only money, or whatever their primary motivation is, in the equation?

These questions came out of a discussion about, among other things, what Edge really is to you, how you use it as a reward, if it should be gained or bought, etc. For the full background check out the above linked thread.