Apparently jersey sales only involves 3 aspects: stats, NT appearance (only applies if they appear for that week, if they don't play that week no NT money), and Allstar.If it's drafted players, that should be under the Homegrown and locals section, where there is no breakdown per player. But I doubt the bonus is really big. My whole squad (except for 2 players, who are also locals) are homegrown, and I only get like 60k+.
So yeah, my hypothesis would be that for national players the top is 15% if they are in the #1 team in the ranking and it drops around 0.08% per position in the ranking, while for foreigners it starts at 10% and it drops around 0.05% per position. If it is not that, it must be very close!