What's a good deal?

[Tokyo!!]

I play in a weekly $30 buy-in tournament league where your finishes accumulate points (as well as cashing for top places etc.). Each week, a small amount of money from the buy-ins is taken out and put to the side for the championship game. The top point getters and those who have won at least one tournament that are also not in the top 9 are freerolled into the championship event. I made it in, but am unable to play due to school reasons. It's been cleared that my friend can play for me who didn't make it into the championship event. I'm having trouble coming up with a reasonable fair deal for splitting any money he makes or having him just pay me for the seat and a small percentage of winnings. My friend is an above average player who was gone for most of this season, which is why he didn't qualify. He has played with these people a fair amount and took 2nd in the championship 2 seasons ago. Any ideas on a fair way to do this?

Relevant info: There are 16 total players for the championship, 2 tables of 8. The top 4 pay, with likely payouts of $700, $450, $200, $100 (unless a seperate deal is made at the table). The starting stacks at my table are as follows, Hero: 50k, then 125k, 75k, 45k, 25k, 25k, 20k. The other table has stacks of 115k, 90k, 80k, 50k, 30k, 25k, 25k, 20k. The blind structure is set for a deep-stacked tournament, with 30 minute levels and starting blinds of 100/200, then 200/400, 400/800, 600/1200, 800/1600, etc. etc.

[tewall]

I think 50/50. On the one hand, you've done a lot more work than he. On the other, he still has to come through at crunch time.