We split prize money according to what share of the league fees you paid. In my two leagues, I paid every single week, so I get 20% and 25% of the prize money for my team. If I'd paid half the season, I'd get 10% or 12.5% instead. One year, I didn't pay the first half, then started the second half when one of our teammates moved. He got the first half prize money, I got the second half (obviously, it was a split season).
If you give the sub anything, it's basically a tip. I'm sure it would be appreciated but as someone who's subbed "full time" and who's been a non-paying team member (basically a sub for only that team), I did not feel as though I deserved any of the money the team won. I never put my own money on the line, I don't get any in return. No matter how well your team placed or how well the sub bowled, they didn't pay for it. If they got in brackets or side pots and won money, that is entirely beside the point.
SH