Here's the breakdown of this year's lost teams grouped by years of experience.
Note that teams 47 & 65 are mixed in here even though they didn't really go away, just merged.
The cause isn't always money though, especially for newish teams.
The program can be quite hard on team leaders who are often new teachers swamped by conflicting responsibilities.
FIRST would need an exit interview-type of study to categorize the reasons.
Code:
Years # Teams
Experience
1 41
2 37
3 30
4 11
5 17
6 7
7 10
8 5
9 3
10 2
11 2
12 1
13 2
14 1