I think there is something missing in the formula. You use probability as a variable so you can't have an absolute answer but some think that tell that with this amount of BR you have 20%, 10%, 5% of chance to run out of money assuming the other factors are right.
French reader may read my post
http://forumserver.twoplustwo.com/sh...umber=11064533
I'm not that a translation would be usefull because this is mostly a rewrite of an article about video poker (
http://www.blackjackforumonline.com/content/VPRoR.htm ).