Base value for each kingdom tribute is 10 points, with each point being worth either 25 gold, 4 souls or 1 glory. When multiple tributes arrive, the old formula used to pick the first, multiply it by the guild statue bonus, add the second, multiply it by the guild statue bonus, add the third, multiply it by the guild statue bonus and so on. The new formula seems to add all up, then multiply them by the guild statue bonus.
Net worth of tributes (at 10 points contribution of each kingdom, disregarding power based multipliers to simply things):
- 10 kingdoms: 175 points old, 110 points new
- 15 kingdoms: 350 points old, 165 points new
- 20 kingdoms: 630 points old, 220 points new
The change happened with this patch. It’s quite obvious when reverse calculating net worth of tributes received, requires a bit of eyeballing though. The hourly income needs to be subtracted and the change to base points at 2 stars (20 points) and 7 stars (30 points) taken into account.