Good point. But you're off by an order of magnitude.
100,000 gallons raised an average of 75 ft is:
100,000 * 8.3 lbs * 32 ft/s^2 * 75 ft = 1,992,000,000 lb*ft^2/s^2 = 23.3 kWh
That's equivalent to about 17 220 Ah, 6 volt batteries, which, new, are anywhere from $75-$100 each. Assuming you only discharge them halfway, that makes 35 batteries, which is like $2600, not including shipping.
Your point is still valid but, at the same time, for some people it may really be easier or more beneficial to build a storage tank on top of a hill than to purchase batteries.
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