The purpose of having the 'Retries' option is for these scenarios:

* If the browser's tab recovery wants to retry the exploit after the first attempt, this option allows the exploit to bail in case the user wants to be more careful not to crash the browser.
* If the module has logging invovled, the option helps avoiding the same browser being tracked or logged repeatedly due to a refresh or whatever. Joev brought this up.

Retries are typically not a very good thing anyway.