Since some people have well over 100 trees and you get a 100 bonus for each new tree planted, do the math. 10 000 points doesn't make sense anymore for people who have reached the 100th tree.
I have 50 of them, and I got a 5000 bonus plus 1000 for a new tree, plus 600 (200+200+200) and 500+500 for a seven-day streak achiever, plus daily tasks and points you earn going through maps, and you literally have a new tree every two days, so 10 000 bonus points don't cut it anymore.