Well ya...using a continuous (instead of discrete) rate of 5% for the rake values, youd find that you could never be given worse than 52.6% pot equity. However...after dealing with some form of rake back...thisll probably go down to something like 52%. Really though, i can only imagine ever being worried about this 2% difference in extremely special circumstances like the example above, because it is rare that we'll see pots that are so much smaller than the bets being made where we could be offered exactly this 52%, and even rarer where we would find that we knew our equity exactly. Additionally, remember that we dont usually account for bluffs when determining our equity and this hidden equity helps to balance out the issue.