1

they think rule will drop into their hands

2

they tried, but were foiled recently

3

they're setting the ruler up to fail badly

4

they're uncertain of their own strength

5

they still need to obtain a critical support

6

their rivalry is more profitable than success

7

they don't trust their own subordinates

8

their supporters have different ideas

9

the ruler is bribing them to inactivity

10

they're waiting for the right catspaws