Earlier quoted context omitted.
Did you know that vanilla financial securities also require upkeep? Approximately 0.5% of the value of all financial assets is burned every year (and potentially an order of magnitude more, depending on what asset and packaging you're talking about).
That's a heck of a figure you're not providing a reference or explanation for at all. Or even an explanation of what you mean by financial securities and "burned".
Mutual funds, the most legible way to get an estimate of the holding cost of securities (since they are required to transact at net asset value) routinely charge between 0.2-1% fees, depending on size and asset class.
Clearinghouses, transfer agents, and cash management firms don't work for free, which is the problem that cryptocurrencies explicitly solve; neither do compliance, KYC, fraud, etc., which most cryptocurrency protocols elide altogether.