Yeah when I first started CRPG I though this would be a good idea. But no, for several reasons.
1. Objectives would take on less meaning, and the KDR would become more important.
2. TW's/TK's would abound much more.
3. Earning money would become much harder at lower levels.
4. People who like to play support/defense roles would be at a huge disadvantage monetarily.
On the flipside of this, I think when you TW, 500g should go from the TW-er to the TW-ee. And for TK's it could be 1000g. (or 250g TW, 500g TK, w/e)