That was my initial reaction, too, but I'm not sure how somebody would use that info, anyway; I don't imagine anybody thinks "I want to run away from this monster and it is free, but if I do, my NEXT one might not be free, so I won't." Considering that I can only use my navel ring in aftercore, I don't ever use it for free runaways.
Revision 8309 should peg the success percent at 100.