I did a random number calculator in excell using a 40% adjusted bet. In other words, my first bet is 40% of 500K, but my second bet is 40% of the remainder. So if I lose, my second bet is 40% of 300K, and if I win, it's 40% of 700K.
I did 20 trials of 50 rolls of the die. After 50 years...