Yeah, that sucks. Losing a player with SPP feels like a previous game was wasted. Losing a positional feels like you are behind a curve and it just takes fun away.
Bad example, I finished an online league with Ogres... I thought I'd play online just for fun... lose most games but doing blood bowl things. But I had an Ogre killed and another Niggled on game 1. Going into game 2, I had only 3 ogres.... at 140k each, I finally got to six ogres on the second to last game. Man, losing and getting only 10k in cash was a kick in the teeth.
It was not as fun as expected.
I want to say.. in this edition you get like 50-60k ( maybe 80-90 ) a game, so you'll get your guys back.. but the money just makes it suck for a little less. Lost SPP is just.. lost.
I would propose that when a player dies or is retired with a permanent injury the team sets up a memorial wall and you can assign 1 SPP to a player of your choice. This player is dedicated to avenging the loss or is energized by the lost players example. It would take some sting out if you can convert a guy that is ALMOST at a skill to a skilled player.
Anyway Weav... good luck.