Ok, I'm gonna explain this as best as I can...
When you click Rollout, you're locked into it. When the Rollout is over, whether it lasted 0, 2 or 5 turns, you have a combined power of the Rollout. For example, if it lasted 3 turns the combined power would be (30 + 60 + 120) 210 base power. However, Rollout lasting 3 turns has a (0.9 x 0.81 x 0.73 x 0.34) 18.09378% chance of happening, which is above the average of a 16.67% chance of happening.
Therefore, the average end result power of Rollout is not simply ((30 + 90 + 210 + 550 + 1030) / 6) 318.33, because all the possible outcomes have varient accuracies. So what is the true combined average base power of Rollout? If you get what I mean.
PS: Can you put the calculations in your answers please? It would be nice to see how you got the final average.