What's Standard Here??

[THEE_LIONN]

I won a seat into the 100k pro-bounty on AP.
Buyin is 1k, and I'm in it for $100 of my own money.
It's all well except I'm mostly a cash game player and not very confident going to the MTT. Someone from my home game wants to buy a piece of me. So if he puts up $500 do I give him 50% of winnings? If not what's standard for this kind of thing.

[zizazziza]

You should be getting for 20-30% for playing. Then take whatever the stake is and divide the % of the stack x 100-(20-30%)
If you are not very confident in your MTT play then theoretically you should be taking 20% for playing and be giving him 40% for buying 50% of you