Time to get this done properly.
(Simple) Half their combined Income.
(Most Varied, good and bad years) Hald their combined Income, with a chance for more and a equal chance for less.
(Small Version) A Quarter of their combined Income with a chance to ge half.
(Pissimistic Version) I DON'T WANT TRADE, LOL!
Time to get this done properly.
I voted for a quarter, but I don't think there should be a chance to get half.