Well done, Wesmip1.

A point of interest - you are assuming a 5% Betfair take-out. But with real betting, the take-out would very soon have to be less than the maximum of 5%.

Not being familiar with the Retirement Staking Plan I don't know how this would affect the amount to be bet per race, but overall it would have to increase the profit on turnover, maybe even with a snowball effect especially if Betfair's take-out continually reduces due to increased turnover? Could it even prolong the life of the initial bank if/when the inevitable(?) losing sequence occurs?