Nail said:For other games, some might replace "my party" with "my individual PC". I eschew those kinds of games, but YMMV.
It depends. How many Fighters give up XP with the exception of an occasional Negative Energy Level?
Spell casters must decide to give up XP both when casting certain spells, and when crafting items (and when hit with the occasional Negative Energy Level).
Hence, in a "party" situation like you describe, the Fighters should be giving up GP every time the Spell Casters are giving up XP. To be fair.
Since this does not happen often (i.e. for most games), I can understand and even support the rational of "my individual PC" with regard to XP. Not so much with regard to GP, but even there, a specific PC (greedy) concept would be good roleplaying.