That's twisting some assumptions of the comparison. The comparison was to casinos, which do not bet decades of profits on a single day's gambling. The equivalen

That's twisting some assumptions of the comparison. The comparison was to casinos, which do not bet decades of profits on a single day's gambling. The equivalent would be investing in your index every payday for decades, not suddenly moving it all at once. That's where the mathematical near inevitability comes from. You aren't betting on one day, one spin of the wheel, you're betting on a general trend across ten thousand spins/days.