Why do you charge storage fees?

Most demand deposit accounts pay 0% interest. European currencies, like the Swiss franc, charge to hold demand deposits.
High-Confidence Money Requires Currency Competition

This view argues for removing the national and international barriers to free and open use of any monetary unit preferred by businesses and households.
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Asset-Backed Cryptocurrencies Are The Future of Money

There are many alternatives to gold, including a variety of commodity baskets, but my favorite is aluminum.