[xenongames]

The key line, I believe is, and the more failures you miss your attempt by, the worse things go for you.. It's not the number of failures that matters (of so, adding dice would be bad), but the margin of failure relative to the difficulty. If you need 10 successes and only get 6 (missing by 4), you are worse off than if you had gotten 9 successes (missing by 1). In this light, having more dice is always better, as they increase your overall chance of success and decrease the margin of failure, should you fail. If you had to get 5 successes, would you rather have 5 dice or 10? The worse you can do is fail by 5, which is more likely with 5 dice than 10.

I have not read the game, but this was my understanding of the mechanics. I could be wrong.