Ive staked many people, and been staked lots of times.
My usual deal for games is 50/50 plus stakeback. So if i send u $100 for a game. And u win $500. You send me the stakeback ($100) then half the profit ($200).
If im staking someone who im dusious about, ill do 60/40 my favour, unless they final table when its 50.50
If someone goes realy deep, ill throw them a bonus, so if they win $2k on a $10 stake, ill get them to send me $750 and keep the rest.